Frequent Unexpected VPN Disconnects on macOS (FortiClient)

[alisherolimov]

I’m having an ongoing issue with FortiClient VPN on my Mac that only affects my device, even though my configuration matches my colleagues who use the same Wi-Fi network.
Here is the issue:

• I can connect to Fortinet VPN successfully.
• After some time (even while I’m actively working and the laptop is fully awake), the VPN disconnects automatically.
• The Mac does not go to sleep, and the Wi-Fi connection stays up.
• My colleagues using the same network and same VPN configuration do not experience any disconnects.

I checked macOS power settings, disabled sleep, and verified network keepalive options — the issue still happens.
 Even after reinstalling macOS and fortinet to latest version, the problem persists.(FortiClient VPN-only free version)

I extracted the FortiClient logs and noticed a repeating pattern:

WM_USER_PIPEMSG_VPN_DISCONNECTED
 failed to load currentvpn
 ssl_state=0
 defaultTunnel=null