I want to use FortiClient VPN-Only in an offline environment

[takeso21425]

How can I use [FortiClient VPN-Only] in an offline environment?

I would like to perform IPsec remote access testing in a closed testing environment, but FortiClient VPN-Only is not functioning correctly offline. When I click "Connect," nothing happens, and it returns to the screen before entering the password.

No packets are reaching the FortiGate side, and when I perform a packet capture on the client, no packets are being generated.

In the testing environment, I am using an L3 switch as a pseudo-internet environment, and there is a Ping response between the client and the FortiGate. The client’s default gateway is the IP address of the FortiGate’s listening port. Even when I connect the client directly to the FortiGate’s listening port without using the pseudo-internet environment, the issue persists.

Is it not possible to use FortiClient VPN-Only in a completely offline environment?

Environment in use:

FortiGate 60F Version 7.4.5 build 2702
Windows 11 FortiClient VPN-Only 7.4.3.1790

[funkylicious · Accepted solution]

there should be no restrictions on where to use forticlient, maybe it just has something to do with the version that you are using.

have you tried a lower version like 7.4.2 or 7.4.1 for FortiClient and see if the issue persists ?