Session is part of Ipsec tunnel (from the responder) local. If the endpoint is currently managed by EMS, do the following: The EMS administrator deregisters the endpoint. View the table below for some assistance in analyzing the debug output. You can confirm this by going to Monitor > IPsec Monitor where you will be able to see your connection. For example, on some models the hardware switch interface used for the local area network is called lan, while on other units it is called internal. To confirm that a VPN between a local network and a dialup client has been configured correctly, at the dialup client, issue a ping command to test the connection to the local network. When ESP provides authentication functions, it uses the same algorithms as AH, but the coverage is different. Use Config Global Mode. If the endpoint is not managed by EMS, proceed to step 2. Authentication Header or AH The AH protocol provides authentication service only. This may or may not indicate problems with the VPN tunnel. If preshared keys are being used for authentication purposes, both VPN peers must have identical preshared keys. This single VPN tunnel will have only one phase 1 (IKE) tunnel / security association and again only one single phase 2 (IPsec) tunnel / SA. A mismatch could occur for many reasons, one of the most common is the instability of an ISP link (ADSL, Cable), or it could effectively be any device in the physical connection. The resulting output should include something similar to the following, where blue represents the remote VPN device, and green represents the local FortiGate. Using a console cable, access the Fortinet command line interface and configure the management port IP address, default gateway, and DNS. If the ping or traceroute fail, it indicates a connection problem between the two ends of the tunnel. Use the FortiGate VPN Monitor page to see whether the IPsec tunnel is up or can be brought up. This is because they require diagnose CLI commands. If you can determine the connection is working properly then any problems are likely problems with your applications. In the event that each GRE tunnel endpoint has keepalive enabled, firewall policies allowing GRE are required in both directions. config system settings set multicast-forward enable. Troubleshooting IPSec VPNs on Fortigate Firewalls. If you want to bounce a particular VPN Tunnel run the following command, dia vpn ike gateway flush name %Tunnel-Name%. To correct the problem, see the following table. Above you can see the different filtering criteria. AH-style authentication authenticates the entire IP packet, including the outer IP header, while the ESP authentication mechanism authenticates only the IP datagram portion of the IP packet. I have created a VPN in my lab and I will break it at different points and identify it on the output of the debug commands. The authentication method (preshared keys or certificates) used by the client must be supported on the FortiGate unit and configured properly. diag debug app ike -1 diag debug enable. If you want to reset the filter list and clear the filter, enter the following. Web mode allows users to access network resources, such as the the AdminPC used in this example. Set Local Address to use a Named Address and select the address for the Edge tunnel interface. Optionally, set Restrict Access to Limit access to specific hosts and specify the addresses of the hosts that are allowed to connect to this VPN. FortiGate models differ principally by the names used and the features available: If you believe your FortiGate model supports a feature that does not appear in the GUI, go to System >Feature Visibility and confirm that the feature is enabled. If you want multicast traffic to traverse the GRE tunnel, you need to configure a multicast policy as well as enable multicast forwarding. If the management interface isnt configured, use the CLI to configure it. On some FortiGate units, such as the FortiGate 94D, you cannot ping over the IPsec tunnel without first setting a source-IP. yes it was the filter. combination in their settings. Ensure that you have allowed inbound and outbound traffic for all necessary network services, especially if services such as DNS or DHCP are having problems. Use the following command to show the proposals presented by both parties. Here we can see the first ISKMP proposal the firewall received. The diagnostics command is available via the nsdiag command in both Microsoft Windows and macOS devices. In this example, you will allow remote users to access the corporate network using an SSL VPN, connecting either by web mode using a web browser or tunnel mode using FortiClient. The plethora of vendors that resell hardware but have zero engineering knowledge resulting in the wrong hardware or configuration being deployed is a major pet peeve of Michael's. Furthermore, in circumstances where multiple remote dialup VPN tunnels exist, each tunnel must have a peer ID set. Make sure that both VPN peers have at least one set of proposals in common for each phase. Most connection failures are due to a configuration mismatch between the FortiGate unit and the remote peer. ; Enter a Name (OfficeRADIUS), the IP address of the FortiAuthenticator, and enter the Secret created before. If you get audited, they WILL ding you on this. When you have only one or two VPN tunnels, it is pretty easy to troubleshoot without filters. Michael Pruett, CISSP has a wide range of cyber-security and network engineering expertise. It may occur once indicating a successful connection, or it will occur two or more times for an unsuccessful connection there will be one proposal listed for each end of the tunnel and each possible Troubleshooting connection issues. Using the output from Obtaining diagnose information for the VPN connection CLI, search for the word proposal in the output. Usually they are quick easy commands to make your day brighter and help you finish up quicker so you can enjoy family, friends, and libations. Session is bridged (vdom is in transparent mode) redir. The resulting output may indicate where the problem is occurring. Use the execute ping command to ping the Cisco device public interface. A red arrow means the tunnel is not processing traffic, and this VPN connection has a problem. Phase II Selectors not matching (you will see this next). Establishing the connection in this manner means the local FortiGate will have its configuration information as well as the information the remote computer sends. Transport Mode Transport Mode provides a secure connection between two endpoints as it encapsulates IPs payload. Here we can see the platform connecting to/from. I am not focused on too many memory, process, kernel, etc. I am going to describe some concepts of IPSec VPNs. This is the output of the command diag vpn tunnel list on the FortiGate: inet ver=1 serial=2 192.168.1.205:4500->121.133.8.18:4500 lgwy=dyn tun=intf mode=auto bound_if=4 proxyid_num=1 child_num=0 refcnt=7 ilast=0 olast=0 stat: rxp=41 txp=56 rxb=4920 txb=3360 dpd: mode=active on=1 idle=5000ms retry=3 count=0 seqno=696 natt: mode=keepalive draft=32 interval=10 remote_port=4500 proxyid=P2_60C_Fortinet proto=0 sa=1 ref=2 auto_negotiate=0 serial=1 src: 0:182.40.101.0/255.255.255.0:0 dst: 0:100.100.100.0/255.255.255.0:0 connection issues, SA: ref=3 options=0000000d type=00 soft=0 mtu=1428 expire=1106 replaywin=0 seqno=15 life: type=01 bytes=0/0 timeout=1777/1800, dec: spi=29a26eb6 esp=3des key=24 bf25e69df90257f64c55dda4069f01834cd0382fe4866ff2 ah=sha1 key=20 38b2600170585d2dfa646caed5bc86d920aed7ff. Additionally, a particular feature may be available only through the CLI on some models, while that same feature may be viewed in the GUI on other models. The first example, we are going to look at non-matching pre-shared keys. Create the VPN tunnels of interest or receive the VPN list of interest from FortiClient EMS. Remove any Phase 1 or Phase 2 configurations that are not in use. Connecting FortiExplorer to a FortiGate via WiFi, Zero touch provisioning with FortiManager, Configuring the root FortiGate and downstream FortiGates, Configuring other Security Fabric devices, Viewing and controlling network risks via topology view, Leveraging LLDP to simplify Security Fabric negotiation, Configuring the Security Fabric with SAML, Configuring single-sign-on in the Security Fabric, Configuring the root FortiGate as the IdP, Configuring a downstream FortiGate as an SP, Verifying the single-sign-on configuration, Navigating between Security Fabric members with SSO, Advanced option - unique SAMLattribute types, OpenStack (Horizon)SDN connector with domain filter, ClearPass endpoint connector via FortiManager, Support for wildcard SDN connectors in filter configurations, External Block List (Threat Feed) Policy, External Block List (Threat Feed) - Authentication, External Block List (Threat Feed)- File Hashes, Execute a CLI script based on CPU and memory thresholds, Viewing a summary of all connected FortiGates in a Security Fabric, Supported views for different log sources, Virtual switch support for FortiGate 300E series, Failure detection for aggregate and redundant interfaces, Restricted SaaS access (Office 365, G Suite, Dropbox), IP address assignment with relay agent information option, Static application steering with a manual strategy, Dynamic application steering with lowest cost and best quality strategies, Per-link controls for policies and SLA checks, DSCP tag-based traffic steering in SD-WAN, SDN dynamic connector addresses in SD-WAN rules, Forward error correction on VPN overlay networks, Controlling traffic with BGP route mapping and service rules, Applying BGP route-map to multiple BGP neighbors, Enable dynamic connector addresses in SD-WAN policies, Configuring the VPN overlay between the HQ FortiGate and cloud FortiGate-VM, Configuring the VPN overlay between the HQ FortiGate and AWS native VPN gateway, Configuring the VIP to access the remote servers, Configuring the SD-WAN to steer traffic between the overlays, Configuring SD-WAN in an HA cluster using internal hardware switches, Associating a FortiToken to an administrator account, Downgrading to a previous firmware version, Setting the administrator password retries and lockout time, Controlling return path with auxiliary session, FGSP (session synchronization) peer setup, Synchronizing sessions between FGCP clusters, Using standalone configuration synchronization, Out-of-band management with reserved management interfaces, HA using a hardware switch to replace a physical switch, FortiGuard third party SSL validation and anycast support, Procure and import a signed SSL certificate, Provision a trusted certificate with Let's Encrypt, NGFW policy mode application default service, Using extension Internet Service in policy, Enabling advanced policy options in the GUI, Recognize anycast addresses in geo-IP blocking, HTTP to HTTPS redirect for load balancing, Use active directory objects directly in policies, FortiGate Cloud / FDNcommunication through an explicit proxy, ClearPass integration for dynamic address objects, Using wildcard FQDN addresses in firewall policies, Changing traffic shaper bandwidth unit of measurement, Type of Service-based prioritization and policy-based traffic shaping, QoS assignment and rate limiting for quarantined VLANs, Content disarm and reconstruction for antivirus, FortiGuard outbreak prevention for antivirus, External malware block list for antivirus, Using FortiSandbox appliance with antivirus, How to configure and apply a DNS filter profile, FortiGuard category-based DNS domain filtering, Protecting a server running web applications, Inspection mode differences for antivirus, Inspection mode differences for data leak prevention, Inspection mode differences for email filter, Inspection mode differences for web filter, Blocking unwanted IKE negotiations and ESP packets with a local-in policy, Basic site-to-site VPN with pre-shared key, Site-to-site VPN with digital certificate, Site-to-site VPN with overlapping subnets, IKEv2 IPsec site-to-site VPN to an AWS VPN gateway, IPsec VPN to Azure with virtual network gateway, IPSec VPN between a FortiGate and a Cisco ASA with multiple subnets, Add FortiToken multi-factor authentication, Dialup IPsec VPN with certificate authentication, OSPF with IPsec VPN for network redundancy, IPsec aggregate for redundancy and traffic load-balancing, Per packet distribution and tunnel aggregation, Hub-spoke OCVPN with inter-overlay source NAT, IPsec VPN wizard hub-and-spoke ADVPN support, Fragmenting IP packets before IPsec encapsulation, Set up FortiToken multi-factor authentication, Connecting from FortiClient with FortiToken, SSL VPN with LDAP-integrated certificate authentication, SSL VPN for remote users with MFA and user case sensitivity, SSL VPN with FortiToken mobile push authentication, SSL VPN with RADIUS on FortiAuthenticator, SSL VPN with RADIUS and FortiToken mobile push on FortiAuthenticator, SSL VPN with RADIUS password renew on FortiAuthenticator, Dynamic address support for SSL VPN policies, Running a file system check automatically, FortiGuard distribution of updated Apple certificates, FSSO polling connector agent installation, Enabling Active Directory recursive search, Configuring LDAP dial-in using a member attribute, Configuring least privileges for LDAP admin account authentication in Active Directory, Activating FortiToken Mobile on a Mobile Phone, Configuring the maximum log in attempts and lockout period, FortiLink auto network configuration policy, Standalone FortiGate as switch controller, Multiple FortiSwitches managed via hardware/software switch, Multiple FortiSwitches in tiers via aggregate interface with redundant link enabled, Multiple FortiSwitches in tiers via aggregate interface with MCLAG enabled only on distribution, HA (A-P) mode FortiGate pairs as switch controller, Multiple FortiSwitches in tiers via aggregate interface with MCLAG enabled on all tiers, MAC layer control - Sticky MAC and MAC Learning-limit, Dynamic VLAN name assignment from RADIUS attribute, Supported log types to FortiAnalyzer, FortiAnalyzer Cloud, FortiGate Cloud, and syslog, Configuring multiple FortiAnalyzers on a multi-VDOM FortiGate, Configuring multiple FortiAnalyzers (or syslog servers) per VDOM, Backing up log files or dumping log messages, Troubleshooting CPU and network resources, Verifying routing table contents in NAT mode, Verifying the correct route is being used, Verifying the correct firewall policy is being used, Checking the bridging information in transparent mode, Performing a sniffer trace (CLI and packet capture), Displaying detail Hardware NIC information, Troubleshooting process for FortiGuard updates, Naming conventions may vary between FortiGate models. This will provide you with clues as to any PSK or other proposal issues. For high levels of authentication such as SHA256, SHA384, and SHA512 hardware offloading is not an optionall VPN processing must be done in softwareunless using an NP6 (although the NP4lite variation also supports SHA256, SHA384, and SHA512). ESP can be used with confidentiality only, authentication only, or both confidentiality and authentication. FortiGate registration and basic settings, Verifying FortiGuard licenses and troubleshooting, Logging FortiGate traffic and using FortiView, Creating security policies for different users, Creating the Admin user, device, and policy, FortiSandbox in the Fortinet Security Fabric, Adding FortiSandbox to the Security Fabric, Adding sandbox inspection to security profiles, FortiManager in the Fortinet Security Fabric, Blocking malicious domains using threat feeds, (Optional) Upgrading the firmware for the HA cluster, Connecting the primary and backup FortiGates, Adding a third FortiGate to an FGCP cluster (expert), Enabling override on the primary FortiGate (optional), Connecting the new FortiGate to the cluster, FGCP Virtual Clustering with two FortiGates (expert), Connecting and verifying cluster operation, Adding VDOMs and setting up virtual clustering, FGCP Virtual Clustering with four FortiGates (expert), Removing existing configuration references to interfaces, Creating a static route for the SD-WAN interface, Blocking Facebook while allowing Workplace by Facebook, Antivirus scanning using flow-based inspection, Adding the FortiSandbox to the Security Fabric, Enabling DNS filtering in a security policy, (Optional) Changing the FortiDNS server and port, Enabling Content Disarm and Reconstruction, Preventing certificate warnings (CA-signed certificate), Importing the signed certificate to your FortiGate, Importing the certificate into web browsers, Preventing certificate warnings (default certificate), Preventing certificate warnings (self-signed), Set up FortiToken two-factor authentication, Connecting from FortiClient with FortiToken, Connecting the FortiGate to FortiAuthenticator, Creating the RADIUS client on FortiAuthenticator, Connecting the FortiGate to the RADIUS server, Site-to-site IPsec VPN with two FortiGate devices, Authorizing Branch for the Security Fabric, Allowing Branch to access the FortiAnalyzer, Desynchronizing settings for Branch (optional), Site-to-site IPsec VPN with overlapping subnets, Configuring the Alibaba Cloud (AliCloud) VPN gateway, SSL VPN for remote users with MFA and user sensitivity. This section contains tips to help you with some common challenges of IPsec VPNs. get system ha status > IPSec VPN Configuration: Fortigate Firewall. l If you are using Perfect Forward Secrecy (PFS), ensure that it is used on both peers. Use the FortiGate VPN Monitor page to see whether the IPsec tunnel is up or can be brought up. Main Mode Main mode requires six packets back and forth, but affords complete security during the establishment of an IPsec connection. Ping the remote network or client to verify whether the connection is up. Session is intercepted by wccp process. The Fortinet Cookbook contains examples of how to integrate Fortinet products into your network and use features such as security profiles, wireless networking, and VPN. Select complementary mode settings. Here is a sample output. Learn how your comment data is processed. This command is very useful for gathering statistical data such as the number of packets encrypted versus decrypted, the number of bytes sent versus received, the SPI identifier, etc. In this example, I left ONLY AES-128 SHA256while the remote firewall had the AES-128 SHA256removed causing a mismatch. Rashmi Bhardwaj wccp. For users connecting via tunnel mode, traffic to the Internet will also flow through the FortiGate, to apply security scanning to this traffic. The remote client must have at least one set of Phase 1 encryption, authentication, and Diffie-Hellman settings that match corresponding settings on the FortiGate unit. See Phase 1 parameters on page 46 and Phase 1 parameters on page 46. For more information, see Feature visibility. If one end of an attempted VPN tunnel is using XAuth and the other end is not, the connection attempt will fail. Configure FortiGate units on both ends for interface VPN l Record the information in your VPN Phase 1 and Phase 2 configurations for our example here the remote IP. If you have determined that your VPN connection is not working properly through Troubleshooting on page 223, the next step is to verify that you have a phase2 connection. The following section includes troubleshooting suggestions related to: l LAN interface connection l Dialup connection l Troubleshooting VPN connections l Troubleshooting invalid ESP packets using Wireshark l Attempting hardware offloading beyond SHA1 l Check Phase 1 proposal settings l Check your routing l Try enabling XAuth. A continuacin se encuentra una seleccin de comandos tiles para solucionar los problemas ms comunes va el CLI de Fortigate. Connecting the FortiGate to the RADIUS server. Without a match and proposal agreement, Phase 1 can never establish. This shows us Phase I is up. Check the security policies. The first diagnostic command worth running, in any IPsec VPN troubleshooting situation, is the following: diagnose vpn tunnel list. Anything sourced from the FortiGate going over the VPN will use this IP address. Attempt to use the VPN and note the debug output in the SSH or Telnet session. Both devices must use the same mode. Start an SSH or Telnet session to your FortiGate unit. Incoming proposal This tells you what the remote gateway is sending you as Phase 1. Save my name, email, and website in this browser for the next time I comment. Did you create an ACCEPT security policy from the public network to the protected network for the L2TP clients? Troubleshooting L2TP and IPsec. FW-01 # get vpn ipsec tunnel name VPN- gateway name: 'VPN-' type: route-based local-gateway: 199.26.76.158:0 (static) Lets start with a little primer on IPSec. Much like NPU-offload in IKE phase1 configuration, you can enable or disable the usage of ASIC hardware for IPsec Diffie-Hellman key exchange and IPsec ESP traffic. Session is part of Ipsec tunnel (from the originator) re. Today we will cover basic FortiGate IPsec Troubleshooting. ; Certain features are not available on all models. High Availability Palo Alto. These commands are typically used by Fortinet customer support to discover more information about your FortiGate unit and its current configuration. See Troubleshooting L2TP and IPsec on page 232. The error saying that the Phase II selector was the issue. For example, on some models the hardware switch interface used for the local area network is called lan, while on other units it is called internal. Check the settings, including encapsulation setting, which must be transport-mode. The Fortinet Cookbook contains examples of how to integrate Fortinet products into your network and use features such as security profiles, wireless networking, and VPN. The command is diagnose vpn ike log-filter dst-addr4 10.11.101.10. Troubleshooting Commands: Fortigate HA. If the packet was encrypted correctly using the correct key, then the decryption will be successful and it will be possible to see the original package as shown below: Repeat the decryption process for the packet capture from the recipient firewall. It is not complete nor very detailled, but provides the basic commands for troubleshooting network related issues that are not resolvable via the GUI. type=INTEGR, val=AUTH_HMAC_SHA_96 type=PRF, val=PRF_HMAC_SHA type=DH_GROUP, val=1536. Tag: firewall, Security. You may need static routes on both ends of the tunnel. Internet Key Exchange or IKE Is the mechanism by which the two devices exchange the keys. Set up the commands to output the VPN handshaking. protocol = IKEv2: encapsulation = IKEv2/none type=ENCR, val=3DES_CBC. Optionally, set Restrict Access to Limit access to specific hosts and specify the addresses of the hosts that are allowed to connect to this VPN. However if not: Have you ever installed a Windows server to do Full Story, Why would you need to export the private key Full Story, I had a customer that installed a wildcard certificate Full Story, 2021 InfoSec Monkey | Design by Fitser, Route-Based VPN between Cisco Router and Fortigate Firewall using OSPF. Select Show More and turn on Policy-based IPsec VPN. If the endpoint is not managed by EMS, proceed to step 2. Ensure that both ends of the VPN tunnel are using Main mode, unless multiple dial-up tunnels are being used. The Fortinet Cookbook contains examples of how to integrate Fortinet products into your network and use features such as security profiles, wireless networking, and VPN. Initiator shows the remote unit is sending the first message. To filter out VPNs so that you focus on the one VPN you are trying to troubleshoot. It is possible to identify a PSK mismatch using the following combination of CLI commands: diag vpn ike log filter name diag debug app ike -1 diag debug enable. This command should only be used for testing, troubleshooting, maintenance, and demonstrations. Confirm that the user is a member of the user group assigned to L2TP. Enter the following command to reset debug settings to default: Enter the following CLI command diagnose sniffer packet any icmp 4. ; Set Listen on Interface(s) to wan1.To avoid port conflicts, set Listen on Port to 10443.; Set Restrict Access to Allow access from any host. config sys global set ipsec-asic-offload [enable | disable] end. FortiGate models differ principally by the names used and the features available: Naming conventions may vary between FortiGate models. The output shows what you would see if there was some filter set. Using zones to simplify firewall policies, (Optional) Configuring SD-WAN Status Check, Allowing traffic from the internal network to the SD-WAN interface, Fortinet Security Fabric installation and audit, (Optional) Adding security profiles to the Security Fabric, Configuring a traffic shaper to limit bandwidth, Verifying your Internet access security policy, Configuring your FortiGate for NGFW policy-based mode, Creating an IPv4 policy to block Facebook, Creating a high priority VoIP traffic shaper, Creating a low priority FTP traffic shaper, Creating a medium priority daily traffic shaper, Adding a VoIP security profile to your Internet access policy, Adding a FortiToken to the FortiAuthenticator, Adding the user to the FortiAuthenticator, Creating the RADIUS client on the FortiAuthenticator, Connecting the FortiGate to the RADIUS server, SAML 2.0 FSSO with FortiAuthenticator and Centrify, Configuring DNS and FortiAuthenticator'sFQDN, Enabling FSSOand SAML on the FortiAuthenticator, Adding SAML connector to Centrify for IdPmetadata, Importing the IdP certificate and metadata on the FortiAuthenticator, Uploading the SP metadata to the Centrify tenant, Configuring Captive Portal and security policies, SAML 2.0 FSSO with FortiAuthenticator and Google G Suite, Configuring FSSO and SAML on the FortiAuthenticator, Importing the IdPcertificate and metadata on the FortiAuthenticator, SAML 2.0 FSSO with FortiAuthenticator and Okta, Configuring the Okta developer account IDP application, Importing the IDP certificate and metadata on the FortiAuthenticator, (Optional) Upgrading the firmware for the HAcluster, Connecting the primary and backup FortiGates, FGCP Virtual Clustering with two FortiGates (expert), Connecting and verifying cluster operation, Adding VDOMs and setting up virtual clustering, FGCP Virtual Clustering with four FortiGates (expert), Troubleshooting the initial cluster configuration, Verifying the cluster configuration from the GUI, Troubleshooting the cluster configuration from the GUI, Verifying the cluster configuration from the CLI, Troubleshooting the cluster configuration from the CLI, Using FGSP to load balance access to two active-active data centers, Configuring the second FortiGate (Peer-2), Configuring the fourth FortiGate (Peer-4), Enabling Web Filtering and Application Control, Edit the default Application Control profile, FortiManager in the Fortinet Security Fabric, Allowing FortiManager to have Internet access, FortiSandbox in the Fortinet Security Fabric, Adding sandbox inspection to security profiles, Using the default deep-inspection profile, Creating an SSL/SSH profile that exempts Google, Transparent web filtering using a virtual wire pair, Configure the virtual wire pair policy and enable web filtering, Preventing certificate warnings (CA-signed certificate), Importing the signed certificate to your FortiGate, Importing the certificate into web browsers, Preventing certificate warnings (default certificate), Preventing certificate warnings (self-signed), Allowing Branch to access the FortiAnalyzer, (Optional) Using local logging for Branch, Site-to-site IPsec VPN with certificate authentication, Site-to-site IPsec VPN with two FortiGates, Configuring the HQ multicast policy and phase 2 settings, Configuring the Branch multicast policy and phase 2 settings, Client-Side SD-WAN with IPsec VPN Deployment Scenario (Expert), Creating the data center side of the IPsec VPN, Adding addresses to the tunnel interfaces, Controlling access to data center networks, Pointing to branch offices with black hole routes, Creating the branch side of the IPsec VPN, Adding IP addresses to the tunnel interfaces, Setting up the load balancing SD-WAN configuration, Creating and customizing the Remote Office tunnel, Connecting and authorizing the FortiAPunit, Dual-band SSID with optional client load balancing, FortiConnect guest on-boarding using RSSO, Registering the WLC as a RADIUS client on the FortiConnect, Registering the FortiGate as a RADIUS accounting server on the FortiConnect, Validating the WLC configuration created from FortiConnect, Creating the wireless ESSprofile on the WLC, Enabling RADIUS accounting listening on the FortiGate, Configuring the RSSOAgent on the FortiGate, FortiConnect as a RADIUS server in FortiCloud, Configuring FortiCloud to access FortiConnect, Configuring FortiCloud as a RADIUS client on FortiConnect, Configuring FortiConnect as a RADIUS server on FortiCloud. Today we will cover basic FortiGate IPsec Troubleshooting. If the ping or traceroute fail, it indicates a connection problem between the two ends of the tunnel. The remote client must have at least one set of Phase 2 encryption and authentication algorithm settings that match the corresponding settings on the FortiGate unit. Here is a list of common problems and what to verify. Stop any diagnose debug sessions that are currently running with the CLI command diagnose debug disable, Clear any existing log-filters by running. By default hardware offloading is used. This configuration adds two-factor authentication (2FA) to the split tunnel configuration (SSL VPN split tunnel for remote user).It uses one of the two free mobile FortiTokens that is already installed on the FortiGate. You can configure the FortiGate unit to log VPN events. responder received SA_INIT msg incoming proposal: protocol = IKEv2: encapsulation = IKEv2/none type=ENCR, val=AES_CBC (key_len = 256). If you are trying to off-load VPN processing to a network processing unit (NPU), remember that only SHA1 authentication is supported. Install a telnet or SSH client such as putty that allows logging of output l Ensure that the admin interface supports your chosen connection protocol so you can connect to your FortiGate unit admin interface. Quick-Tips are short how tos to help you out in day-to-day activities. diagnose debug app ike 255 diagnose debug enable. At the conclusion of phase 2 each peer will be ready to pass data plane traffic through the VPN. If routing is the problem, the proposal will likely setup properly but no traffic will flow. If the egress/outgoing interface (determined by kernel route) has an IP address, then use the IP address of the egress/outgoing interface. See Phase 1 parameters on page 46 and Phase 2 parameters on page 66. Uninstalling FortiClient. Here is an example of a route-based VPN configured on a Palo Alto Networks firewall. Before you begin troubleshooting, you must: address is 10.11.101.10 and the names of the phases are Phase 1 and Phase 2. (IP address or modified). All messages in phase 2 are secured using the ISAKMP SA established in phase 1. ; Enter the Username (client2) and password, then click Next. This section describes some checks and tools you can use to resolve issues with L2TP-over-IPsec VPNs. The Fortinet Cookbook contains examples of how to integrate Fortinet products into your network and use features such as security profiles, wireless networking, and VPN. If the decryption failed using the same key, the packet may be corrupted and the interface should then be checked for CRC or packet errors. Go to System > Feature Visibility. For example, on some models the hardware switch interface used for the local area network is called. While its advertised features are powerful and exactly what I need, I can't even access the means of configuring them. Ensure that both ends use the same P1 and P2 proposal settings (seeThe SA proposals do not match (SA proposal mismatch) below). Port 1 is the management interface. See Phase 1 parameters on page 46. (Edit: That was back in August of 2021 and the big scanning ended around two weeks after it has started. Not all FortiGates have the same features, particularly entry-level models (models 30 to 90). The output will show packets coming in from the GRE interface going out of the interface that connects to the protected network (LAN) and vice versa. This kind of information in the resulting output can make all the difference in determining the issue with the VPN. Maybe this will meet my needs: TP-Link SafeStream TL-ER604W Wireless N300 Gigabit Broadband Desktop VPN Router, 120M NAT throughput, 10k Concurrent Sessions, 256 DHCP Clients, 20 VPN Tunnels Finally the error telling you no matching Phase II found. Select or clear both options as required. A green arrow means the tunnel is up and currently processing traffic. High Availability Palo Alto. This makes the remote FortiGate the initiator and the local FortiGate becomes the responder. The most common IPsec VPN issues are listed below. This section shows it is receiving AES 128 with a Hash of SHA 256, Shows that we matched a particular VPN we have configured and it matches what I created. If it is a PSK mismatch, you should see something similar to the following output: ike 0:TRX:322: PSK auth failed: probable pre-shared key mismatch ike Negotiate SA Error: The most common problem with IPsec VPN tunnels is a mismatch between the proposals offered between each party. This will allow you to review the data later on at your own speed without worry about missed data as the diag output scrolls by. The Fortinet Cookbook contains examples of how to integrate Fortinet products into your network and use features such as security profiles, wireless networking, and VPN. You might need to pin the PAT/NAT session table, or use some of kind of NAT-T keepalive to avoid the expiration of your PAT/NAT translation. This may or may not indicate problems with the VPN tunnel, or dialup client. Alert email can be configured to report L2TP errors. Here is a list of the options that you can set up, The most used will be src-addr4 or dst-addr4. Watch the screen for output, and after roughly 15 seconds enter the following CLI command to stop the output. In general, begin troubleshooting an IPsec VPN connection failure as follows: If you are configuring authentication parameters for FortiClient dialup clients, refer to the Authenticating FortiClient Dialup Clients Technical Note. ; Select Test Connectivity to be sure you can connect to the RADIUS server. As with the LAN connection, confirm the VPN tunnel is established by checking Monitor > IPsec Monitor. This command will inform you of any lack of firewall policy, lack of forwarding route, and of policy ordering issues. When a VPN connection is properly established, traffic will flow from one end to the other as if both ends were physically in the same place. Using the Cookbook, you can go from idea to execution in simple steps, configuring a secure network for better productivity with reduced risk. l Check that a static route has been configured properly to allow routing of VPN traffic. nlb. NPU offloading is supported when the local gateway is a loopback interface. vpn tunnel list command to troubleshoot this. For more information, see Phase 1 parameters on page 46. During the connecting phase, the FortiGate will also verify that the remote users antivirus software is installed and up-to-date. Phase II IKE phase 2 establishes IPSec SAs (one in each direction) for the VPN connection, and is referred to as Quick Mode. The VPN tunnel initializes when the dialup client attempts to connect. Check the routing behind the dialup client. Setting up your FortiGate for FSSO. FortiGate registration and basic settings, Verifying FortiGuard licenses and troubleshooting, Logging FortiGate traffic and using FortiView, Creating security policies for different users, Creating the Admin user, device, and policy, FortiSandbox in the Fortinet Security Fabric, Adding FortiSandbox to the Security Fabric, Adding sandbox inspection to security profiles, FortiManager in the Fortinet Security Fabric, Blocking malicious domains using threat feeds, (Optional) Upgrading the firmware for the HA cluster, Connecting the primary and backup FortiGates, Adding a third FortiGate to an FGCP cluster (expert), Enabling override on the primary FortiGate (optional), Connecting the new FortiGate to the cluster, FGCP Virtual Clustering with two FortiGates (expert), Connecting and verifying cluster operation, Adding VDOMs and setting up virtual clustering, FGCP Virtual Clustering with four FortiGates (expert), Removing existing configuration references to interfaces, Creating a static route for the SD-WAN interface, Blocking Facebook while allowing Workplace by Facebook, Antivirus scanning using flow-based inspection, Adding the FortiSandbox to the Security Fabric, Enabling DNS filtering in a security policy, (Optional) Changing the FortiDNS server and port, Enabling Content Disarm and Reconstruction, Preventing certificate warnings (CA-signed certificate), Importing the signed certificate to your FortiGate, Importing the certificate into web browsers, Preventing certificate warnings (default certificate), Preventing certificate warnings (self-signed), Set up FortiToken two-factor authentication, Connecting from FortiClient with FortiToken, Connecting the FortiGate to FortiAuthenticator, Creating the RADIUS client on FortiAuthenticator, Connecting the FortiGate to the RADIUS server, Site-to-site IPsec VPN with two FortiGate devices, Authorizing Branch for the Security Fabric, Allowing Branch to access the FortiAnalyzer, Desynchronizing settings for Branch (optional), Site-to-site IPsec VPN with overlapping subnets, Configuring the Alibaba Cloud (AliCloud) VPN gateway, SSL VPN for remote users with MFA and user sensitivity. Both VPN peers must have the same NAT traversal setting (enabled or disabled). Authentication OK. If you are using FortiClient, ensure that your version is compatible with the FortiGate firmware by reading the FortiOS Release Notes. ; Certain features are not available on all models. There are two Fortigate HA modes available: Active / Passive- Configuration of primary and secondary devices are in synchronisation. When the management IP address is set, access the FortiGate login screen using the new management IP address. Troubleshooting Commands: Fortigate HA. By: Aug 11, 2022. To configure an SSL VPN server in tunnel and web mode with dual stack support in the GUI: Create a local user: Go to User & Authentication > User Definition and click Create New.The Users/Groups Creation Wizard opens. In this scenario, you could have AES-256 SHA-256 but it not be configured on the other side. NAT-T or NAT Traversal mismatch on either side. You can use the diagnose vpn tunnel list command to troubleshoot this. Check your NAT settings, enabling NAT traversal in the Phase 1 configuration while disabling NAT in the security policy. Tag: firewall, Security. Verify the configuration of the FortiGate unit and the remote peer. When an IPsec VPN tunnel is up, but traffic is not able to pass through the tunnel, Wireshark (or an equivalent program) can be used to determine whether there is an encryption mismatch. This section describes some checks and tools you can use to resolve issues with L2TP-over-IPsec VPNs. Since last week, we observed a lot of failed SSL-VPN login events on various FortiGate setups. Using the Cookbook, you can go from idea to execution in simple steps, configuring a secure network for better productivity with reduced risk. Log into the CLI as admin with the output being logged to a file. It is easiest to see if the final stage is successful first since if it is successful the other stages will be working properly. When you are finished, disable the diagnostics by using the following command: diagnose debug reset diagnose debug disable. On the Windows PC, check that the IPsec service is running and has not been disabled. Otherwise, use the IP address of the first interface from the interface list (that has an IP address). type=INTEGR, val=AUTH_HMAC_SHA_2_256_128 type=PRF, val=PRF_HMAC_SHA2_256 type=DH_GROUP, val=1536. Using the Cookbook, you can go from idea to execution in simple steps, configuring a secure network for better productivity with reduced risk. If you do not know the other ends settings enable or disable XAuth on your end to see if that is the problem. If this appears to be the case, configure a DHCP relay service to enable DHCP requests to be relayed to a DHCP server on or behind the FortiGate server. Otherwise, you will need to work back through the stages to see where the problem is located. Pre-shared Key authentication is successful. Prior to FortiOS 4.0 MR3, FortiOS refused L2TP connections with empty AVP host names in compliance with RFC 2661 and RFC 3931. Essentially, you would see 10.x.x.x/24 on one side but the other configured as 192.168.0.0/24 as an example. Traceroute the remote network or client. Phase I The purpose of phase 1 is to establish a secure channel for control plane traffic. For users connecting via tunnel mode, traffic to the Internet will also flow through the FortiGate, to apply security scanning to this traffic. Check the following IPsec parameters: l The mode setting for ID protection (main or aggressive) on both VPN peers must be identical. diaike 0: comes 10.12.101.1:500->10.11.101.1:500,ifindex=26. There are two Fortigate HA modes available: Active / Passive- Configuration of primary and secondary devices are in synchronisation. Check Phase 1 configuration. Ensure that both sides have at least one Phase 1 proposal in common. Run the diag vpn tunnel list command a few times on both FortiGates when generating traffic that will pass through the tunnel. For example if 10.11.101.10 selected both Diffie-Hellman Groups 1 and 5, that would be at least 2 proposals set. This site uses Akismet to reduce spam. In this section, I removed PFS on one side of the VPN. The result of a successful phase 1 operation is the establishment of an ISAKMP SA which is then used to encrypt and verify all further IKE communications. Under Phase 2 Selectors, create a new Phase 2. The command is located in the Client installation directory: If DNS is working, you can use domain names. When the management IP address is set, access the FortiGate login screen using the new management IP address. Alternatively, you can enter netplwiz. Because of this, you would not see this error. Configuring the SSL VPN tunnel. Enter control userpasswords2 and press Enter. Take a packet sniffer trace on both FortiGates. FortiGate models differ principally by the names used and the features available: Naming conventions may vary between FortiGate models. Session is attached to local fortigate ip stack. Certain features are not available on all models. A 1500 byte MTU is going to exceed the overhead of the ESP-header, including the additional ip_header,etc. Lets start with a little primer on IPSec. Fortinet GURU is not owned by or affiliated with, Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window), Click to share on LinkedIn (Opens in new window), Click to share on Tumblr (Opens in new window), Click to share on Reddit (Opens in new window), Check Out The Fortinet Guru Youtube Channel, Logging violations of the MAC address learning limit (480808), Collectors and Analyzers FortiAnalyzer FortiOS 6.2.3, High Availability FortiAnalyzer FortiOS 6.2.3, Two-factor authentication FortiAnalyzer FortiOS 6.2.3, Global Admin GUI Language Idle Timeout FortiAnalyzer FortiOS 6.2.3, Global Admin Password Policy FortiAnalyzer FortiOS 6.2.3, Global administration settings FortiAnalyzer FortiOS 6.2.3, SAML admin authentication FortiAnalyzer FortiOS 6.2.3, If there are more than one preshared key dial-up VPN with the same local gateway, use, Error: connection expiring due to XAUTH failure, Check user credentials and user group configuration, Error: peer has not completed XAUTH exchange, Route or firewall policy misconfiguration, Route-based: traffic must be routed to IPsec virtual interface Policy-based: traffic must match a. This section explains how to get started with a FortiGate. spi=c32b09f7 seq=00000012. For this example, default values were used unless stated otherwise. FortiGate models differ principally by the names used and the features available: Naming conventions may vary between FortiGate models. However if you have 10, 20, 100, 1000 VPN tunnels, it is impossible to do so without filtering the output.. By running the command above, you will see if you have any filters currently set up. I am going to describe some concepts of IPSec VPNs. Because you have installed FSSSO in advanced mode, you need to configure LDAP to use with FSSO. If the connection has problems, see Troubleshooting VPN connections on page 227. If your VPN fails to connect, check the following: If you are still unable to connect to the VPN tunnel, run the following diagnostic command in the CLI: diagnose debug application ike -1 diagnose debug enable. Should you need to clear an IKE gateway, use the following commands: diagnose vpn ike restart diagnose vpn ike gateway clear. You may not want to bounce the tunnel, but you may want to clear the counters on the tunnel so you could see encrypts and decrypts. For debugging purposes, sometimes it is best for all the traffic to be processed by software. For example, on some models the hardware switch interface used for the local area network is called lan, while on other units it is called internal. In this scenario, you must assign an IP address to the virtual IPsec VPN interface. The following section provides information to help debug an encryption key mismatch. This allows you to filter a VPN to a destination of 2.2.2.2 as an example: diagnose vpn ike log-filter dst-addr4 2.2.2.2. For example: 114.124303 gre1 in 10.0.1.2 -> 10.11.101.10: icmp: echo request, 114.124367 port2 out 10.0.1.2 -> 10.11.101.10: icmp: echo request, 114.124466 port2 in 10.11.101.10 -> 10.0.1.2: icmp: echo reply, 114.124476 gre1 out 10.11.101.10 -> 10.0.1.2: icmp: echo reply. enc: spi=c32b09f7 esp=3des key=24 0abd3c70032123c3369a6f225a385d30f0b2fb1cd9687ec8 ah=sha1 key=20 214d8e717306dffceec3760464b6e8edb436c6 This is the packet capture from the FortiGate: To verify, it is necessary to decrypt the ESP packet using Wireshark. On the Windows system, Start an elevated command line prompt. br. After each attempt to start the L2TP over IPsec VPN, select. ; Optionally, configure the contact Attempt to use the VPN or set up the VPN tunnel and note the debug output. AH provides data integrity, data origin authentication, and an optional replay protection service. If you are using manual keys to establish a tunnel, the. This section includes: Quick checks l Mac OS X and L2TP; Setting up logging; Using the FortiGate unit debug commands; Quick checks. See Troubleshooting GRE over IPsec on page 235. This section includes support for the following: l Failed VPN connection attempts l Debug output table l The options to configure policy-based IPsec VPN are unavailable l The VPN tunnel goes down frequently l The pre-shared key does not match (PSK mismatch error) l The SA proposals do not match (SA proposal mismatch) l Pre-existing IPsec VPN tunnels need to be cleared l Other potential VPN issues. If this happens, try removing some of the unused proposals. See Troubleshooting GRE over IPsec on page 235. Ensure that VPN is enabled before logon to the FortiClient Settings page. If your FortiGate unit is behind a NAT device, such as a router, configure port forwarding for UDP ports 500 and 4500. There are some diagnostic commands that can provide useful information. The table below is a list of common L2TP over IPsec VPN problems and the possible solutions. The policy should be configured as follows (where the IP addresses and interface names are for example purposes only): set srcintf gre set dstintf port1 set srcaddr 1.1.1.1 set dstaddr 2.2.2.2 set action accept set schedule always set service GRE. See Phase 1 parameters on page 46. Virtual switch support for FortiGate 300E series 6.2.2 IPsec VPN wizard hub-and-spoke ADVPN support 6.2.2 FortiGuard communication over port 443 with HTTPS 6.2.2 IPv6 FortiGuard connections 6.2.2 SSH file scan 6.2.2 This is intended as a quick-tip but I have another article that dives a little deeper into the PSK errors etc. Now lets set a filter for the dst-addr4and enter the IP address of the peer. To configure the LDAP service, go to User & Device > LDAP Servers and select Create New. If you have multiple dial-up IPsec VPNs, ensure that the peer ID is configured properly on the FortiGate and that clients have specified the correct local ID. diagnose vpn ike log-filter dst-addr4 %Peer-IP%, Then we are going to start debugging IKE and the -255 is the verbosity (another useful one is -1, My proposal This tells you what your firewall is offering as a Phase 1. Routing problems may be affecting DHCP. The Fortinet Cookbook contains examples of how to integrate Fortinet products into your network and use features such as security profiles, wireless networking, and VPN. If it fails, it will remove any routes over the GRE interface. handshake between the ends of the tunnel is in progress. This filters out all VPN connections except ones to the IP address we are concerned with. Encapsulating Security Payload or ESP The ESP protocol provides data confidentiality by using encryption and authentication (data integrity, data origin authentication, and replay protection). See the following configuration guides: L2TP and diagnose debug application ike -1 diagnose debug application l2tp -1 diagnose debug enable, 2010-01-11 16:39:58 log_id=0101037127 type=event subtype=ipsec pri=notice vd=root msg=progress IPsec Phase 1 action=negotiate rem_ip=172.20.120.151 loc_ip=172.20.120.141 rem_port=500 loc_port=500 out_ intf=port1 cookies=5f6da1c0e4bbf680/d6a1009eb1dde780 user=N/A group=N/A xauth_user=N/A xauth_ group=N/A vpn_tunnel=dialup_p1 status=success init=remote mode=main dir=outbound stage=1 role=responder result=OK, 2010-01-11 16:39:58 log_id=0101037127 type=event subtype=ipsec pri=notice vd=root msg=progress IPsec Phase 1 action=negotiate rem_ip=172.20.120.151 loc_ip=172.20.120.141 rem_port=500 loc_port=500 out_ intf=port1 cookies=5f6da1c0e4bbf680/d6a1009eb1dde780 user=N/A group=N/A xauth_user=N/A xauth_ group=N/A vpn_tunnel=dialup_p1 status=success init=remote mode=main dir=outbound stage=2 role=responder result=OK, 2010-01-11 16:39:58 log_id=0101037127 type=event subtype=ipsec pri=notice vd=root msg=progress IPsec Phase 1 action=negotiate rem_ip=172.20.120.151 loc_ip=172.20.120.141 rem_port=500 loc_port=500 out_ intf=port1 cookies=5f6da1c0e4bbf680/d6a1009eb1dde780 user=N/A group=N/A xauth_user=N/A xauth_ group=N/A vpn_tunnel=dialup_p1 status=success init=remote mode=main dir=inbound stage=3 role=responder result=DONE, 2010-01-11 16:39:58 log_id=0101037127 type=event subtype=ipsec pri=notice vd=root msg=progress IPsec Phase 1 action=negotiate rem_ip=172.20.120.151 loc_ip=172.20.120.141 rem_port=500 loc_port=500 out_ intf=port1 cookies=5f6da1c0e4bbf680/d6a1009eb1dde780 user=N/A group=N/A xauth_user=N/A xauth_ group=N/A vpn_tunnel=dialup_p1_0 status=success init=remote mode=main dir=outbound stage=3 role=responder result=DONE, 2010-01-11 16:39:58 log_id=0101037129 type=event subtype=ipsec pri=notice vd=root msg=progress IPsec Phase 2 action=negotiate rem_ip=172.20.120.151 loc_ip=172.20.120.141 rem_port=500 loc_port=500 out_ intf=port1 cookies=5f6da1c0e4bbf680/d6a1009eb1dde780 user=N/A group=N/A xauth_user=N/A xauth_ group=N/A vpn_tunnel=dialup_p1_0 status=success init=remote mode=quick dir=outbound stage=1 role=responder result=OK, 2010-01-11 16:39:58 log_id=0101037133 type=event subtype=ipsec pri=notice vd=root msg=install IPsec SA action=install_sa rem_ip=172.20.120.151 loc_ip=172.20.120.141 rem_port=500 loc_port=500 out_ intf=port1 cookies=5f6da1c0e4bbf680/d6a1009eb1dde780 user=N/A group=N/A xauth_user=N/A xauth_ group=N/A vpn_tunnel=dialup_p1_0 role=responder in_spi=61100fe2 out_spi=bd70fca1, 2010-01-11 16:39:58 log_id=0101037139 type=event subtype=ipsec pri=notice vd=root msg=IPsec Phase 2 status change action=phase2-up rem_ip=172.20.120.151 loc_ip=172.20.120.141 rem_port=500 loc_port=500 out_intf=port1 cookies=5f6da1c0e4bbf680/d6a1009eb1dde780 user=N/A group=N/A xauth_user=N/A xauth_group=N/A vpn_tunnel=dialup_p1_0 phase2_name=dialup_p2, 2010-01-11 16:39:58 log_id=0101037138 type=event subtype=ipsec pri=notice vd=root msg=IPsec connection status change action=tunnel-up rem_ip=172.20.120.151 loc_ip=172.20.120.141 rem_port=500 loc_port=500 out_intf=port1 cookies=5f6da1c0e4bbf680/d6a1009eb1dde780 user=N/A group=N/A xauth_ user=N/A xauth_group=N/A vpn_tunnel=dialup_p1_0 tunnel_ip=172.20.120.151 tunnel_id=1552003005 tunnel_type=ipsec duration=0 sent=0 rcvd=0 next_stat=0 tunnel=dialup_p1_0, 2010-01-11 16:39:58 log_id=0101037129 type=event subtype=ipsec pri=notice vd=root msg=progress IPsec Phase 2 action=negotiate rem_ip=172.20.120.151 loc_ip=172.20.120.141 rem_port=500 loc_port=500 out_ intf=port1 cookies=5f6da1c0e4bbf680/d6a1009eb1dde780 user=N/A group=N/A xauth_user=N/A xauth_ group=N/A vpn_tunnel=dialup_p1_0 status=success init=remote mode=quick dir=inbound stage=2 role=responder result=DONE, 2010-01-11 16:39:58 log_id=0101037122 type=event subtype=ipsec pri=notice vd=root msg=negotiate IPsec Phase 2 action=negotiate rem_ip=172.20.120.151 loc_ip=172.20.120.141 rem_port=500 loc_port=500 out_ intf=port1 cookies=5f6da1c0e4bbf680/d6a1009eb1dde780 user=N/A group=N/A xauth_user=N/A xauth_ group=N/A vpn_tunnel=dialup_p1_0 status=success role=responder esp_transform=ESP_3DES esp_auth=HMAC_ SHA1, 2010-01-11 16:39:58 log_id=0103031008 type=event subtype=ppp vd=root pri=information action=connect status=success msg=Client 172.20.120.151 control connection started (id 805), assigned ip 192.168.0.50, 2010-01-11 16:39:58 log_id=0103029013 type=event subtype=ppp vd=root pri=notice pppd is started, 2010-01-11 16:39:58 log_id=0103029002 type=event subtype=ppp vd=root pri=notice user=user1 local=172.20.120.141 remote=172.20.120.151 assigned=192.168.0.50 action=auth_success msg=User user1 using l2tp with authentication protocol MSCHAP_V2, succeeded, 2010-01-11 16:39:58 log_id=0103031101 type=event subtype=ppp vd=root pri=information action=tunnel-up tunnel_id=1645784497 tunnel_type=l2tp remote_ip=172.20.120.151 tunnel_ip=192.168.0.50 user=user1 group=L2TPusers msg=L2TP tunnel established. See Troubleshooting L2TP and IPsec on page 232. The log messages for the attempted connection will not mention XAuth is the reason, but when connections are failing it is a good idea to ensure both ends have the same XAuth settings. To configure a multicast policy, use the config firewall multicast-policy. This section describes some checks and tools you can use to resolve issues with the GRE-over-IPsec VPN. And finally, Some remote firewalls such as Cisco, do not like Fortinet/Palo/Checkpoint etc groups on Phase II Selectors. Check routing. Testing Phase 1 and 2 connections is a bit more difficult than testing the working VPN. If there are many proposals in the list, this will slow down the negotiating of Phase 1. AH authenticates IP headers and their payloads, with the exception of certain header fields that can be legitimately changed in transit, such as the Time To Live (TTL) field. protocol = IKEv2: encapsulation = IKEv2/none type=ENCR, val=AES_CBC (key_len = 128) type=INTEGR, val=AUTH_HMAC_SHA_96 type=PRF, val=PRF_HMAC_SHA type=DH_GROUP, val=1536. This output tells you that you are the initiatorand the proposal is 3DES-SHA1(not recommended BTW). If traffic is not passing through the FortiGate unit as you expect, ensure the traffic does not contain IPcomp packets (IP protocol 108, RFC 3173). To get a list of configured VPNs, running the following command: This is a good view to see what is up and passing traffic. Go to Edit > Preferences, expand Protocol and look for ESP. Check the encapsulation setting: tunnel-mode or transport-mode. The FortiGate can send a GRE keepalive response to a Cisco device to detect a GRE tunnel. Session is redirected to an internal FGT proxy. L2TP logging must be enabled to record L2TP events. Select Convert To Custom Tunnel. This recipe is in the Basic FortiGate network collection. To confirm whether a VPN connection over LAN interfaces has been configured correctly, issue a ping or traceroute command on the network behind the FortiGate unit to test the connection to a computer on the remote network. ; Set the User Type to Local User and click Next. To enable multicast forwarding, use the following commands: Ping an address on the network behind the FortiGate unit from the network behind the Cisco router. Configuring an IPSec VPN Tunnel. Attempt to use the VPN and note the debug output. This is intended as a quick-tip but I have another article that dives a little deeper into the PSK errors etc. Set the log-filter to the IP address of the remote computer (10.11.101.10). This site was started in an effort to spread information while providing the option of quality consulting services at a much lower price than Fortinet Professional Services. get system ha status > IPSec VPN Configuration: Fortigate Firewall. When I started doing VPN way back and there were filters set up, I would be dumbfounded at why I was not receiving any traffic from a particular gateway. details. Another appropriate diagnostic command worth trying is: diagnose debug flow. 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ipsec vpn fortigate troubleshooting 2022