FortiGate 60F SSL VPN – Connected but Internal Resources Not Reachable (Reconnection Does Not Fix Issue)

Hi everyone,

We are using a FortiGate 60F firewall with SSL VPN configured for remote access, and users connect via FortiClient VPN.

Issue Description

• SSL VPN connects successfully every time via FortiClient
• Users receive VPN IP and session remains connected without disconnecting
• Internal resources (servers, RDP etc.) are intermittently not reachable
• When the issue occurs, VPN reconnect does NOT resolve the problem
• Users must either wait or restart system/network stack, but behavior is inconsistent

Key Observation

• The issue does NOT occur on all clients at the same time
• Some users continue working normally while others lose access randomly
• Affected clients remain “connected” but cannot reach internal network resources
• Once the issue occurs, re-establishing VPN session does not fix it

What we have checked so far

• VPN tunnel remains up with assigned IP
• Issue appears random across users and sessions
• No clear pattern related to user group or time
   

  Has anyone faced a similar issue on FortiGate SSL VPN (60F or similar models) where:
  VPN stays connected but internal resources become unreachable, and even reconnecting the VPN does NOT restore access?

  Any guidance on logs to check or known FortiOS behavior would be highly appreciated.

  Thanks in advance.