FortiGate
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.
princes
Staff
Staff
Article Id 350948
Description This article describes that If users are using FortiClient to connect with SSL VPN configured on the FortiGate then have mentioned primary and secondary remote gateway for failover in case the primary goes down. Now in this setup, the control to start SSL negotiation is on the endpoint level (FortiClient).

FortiGate will always respond from the gateway it received SSL negotiation packets on.
Scope FortiClient.
Solution

This can be verified with a packet sniffer on FortiGate,  which only receives traffic from the primary gateway. If the primary gateway goes down it will not do automatic failover (for the free version of FortiClient)

 

Screenshot 2024-10-21 144044.png

 

If the primary gateway goes down user needs to change the remote gateway manually .(all free versions of FortiClient)

 

Here are the workarounds to make this auto-failover for SSL gateway possible:

  1. Take an EMS license so multiple remote gateways can be configured with auto-failover mode.
  2. Manually change the remote gateway each time a failover is required.
  3. Or create a single DDNS instead of multiple IP addresses (those should resolved in any of the active Interface IP addresses on FortiGate).

 

Related document:

Configuring a backup VPN connection

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