Description
This article describes how to troubleshoot the VPN fail route from PC Client which it has Windows 11 installed with FortiClient.
Scope
FortiGate v6.4.10, FortiClient v7.0.1.0083.
Solution
Usually, the behavior is that the VPN is working correctly on Windows 10 or earlier, but when Windows 11 is used, the connection is successful but 0 KB is received.
Consider checking the VPN SSL logs on FortiGate and this message will appear:
'Cannot determine ethernet address for proxy ARP',
Open a CMD window and a different IP address like 169.254.146.223 or something similar instead the IP pool is configured as below.
If the remote services are pinged, the ping will not work:
Uninstall Windows Update: KB2693643 and restart the system.
After that, the connection will be successful and the traffic will flow through the VPN connection.
