FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
Article Id 307419
Description This article describes the issue where the SSL VPN is not working on a loopback interface in an SD-WAN environment.
Scope FortiGate 7.0+

If SSL VPN is set up on a different loopback interface for multiple WAN interfaces in an SD-WAN environment,  it is possible to see one or more of them not connected.

One possible reason is that the VIP configuration goes from WAN to the loopback interface.


Check the VIP that is configured from WAN to loopback. If the interface is configured as the specific WAN interface it may be causing the issue:




If  something like this appears, delete the VIP and recreate it by specifying ‘any’ in Interface as shown below:




After that, test the SSL VPN again and it should connect.