![]() If you are still unable to connect to the VPN tunnel, run the following diagnostic command in the CLI: diagnose debug application ike -1 If a duplicate instance of the VPN tunnel appears on the IPsec Monitor, reboot your FortiGate unit to try and clear the entry. Remove any Phase 1 or Phase 2 configurations that are not in use.If your FortiGate unit is behind a NAT device, such as a router, configure port forwarding for UDP ports 5.You can use the diagnose vpn tunnel list command to troubleshoot this. A 1500 byte MTU is going to exceed the overhead of the ESP-header, including the additional ip_header,etc. Check IPsec VPN Maximum Transmission Unit (MTU) size. ![]() If XAUTH is enabled, ensure that the settings are the same for both ends, and that the FortiGate unit is set to Enable as Server.This is especially useful if the remote endpoint is not a FortiGate device. If part of the setup currently uses firewall addresses or address groups, try changing it to either specify the IP addresses or use an expanded address range. Ensure that the Quick Mode selectors are correctly configured.If you are using Perfect Forward Secrecy (PFS), ensure that it is used on both peers.If you are using FortiClient, ensure that your version is compatible with the FortiGate firmware by reading the FortiOS Release Notes.FortiGate and that clients have specified the correct Local ID.If you have multiple dial-up IPsec VPNs, ensure that the Peer ID is configured properly on the.Ensure that both ends of the VPN tunnel are using Main mode, unless multiple dial-up tunnels are being used.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. Check your NAT settings, enabling NAT traversal in the Phase 1 configuration while disabling NAT in the security policy.Ensure that your FortiGate unit is in NAT/Route mode, rather than Transparent.Check that a static route has been configured properly to allow routing of VPN traffic.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.Ensure that both ends use the same P1 and P2 proposal settings (see The SA proposals do not match (SA proposal mismatch) below). ![]()
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