Again we have changed and take the debug again to see the root cause of the issue. Troubleshooting FortiGate VPN CASE 2: Issue with Negotiation Algorithms Now we can see the pre-shared key is mismatched. Now capture the logs from cli and run below command to stop the packet capture diagnose vpn ike log-filter destination.And run debug IKE to capture the packets. We will perform debug through cli to check the issue. Now we have changed some configuration settings in firewall which will manually bring down the VPN IPSec site.Īnd will troubleshoot the issue to identify the root cause. Troubleshooting FortiGate VPN CASE 1: Issue with Pre-shared Key You need to ping the VPN from one source to another source which will initiate traffic from one VPN Now the current situation is that both the FortiGate VPN of Site A and Site B are down and when we try to establish the traffic and send traffic over VPN tunnel which should bring the tunnel up. We have both firewalls Peer A and Peer B, both firewalls are using FortiGate firewalls side by side Two firewalls are connected over IPSec VPN which means PC A can communicate to PC B You can see in the image above that the setup is very simple.
We are using below topology to troubleshoot the FortiGate VPN IPSec tunnel issues
Here in this post we will understand how to trouble shoot the FortiGate VPN tunnel IKE failures. In our previous post, we have already discussed the IPSec VPN Configuration in Fortigate Firewall.
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