Does anyone meets similar problem with IPsec, and that is when turn off PING on WAN interface, tunnel goes down? When enable PING back on WAN interface, tunnels back UP/UP.
Hi, I'm not aware of such an issue. It might require closer look at your tunnel configs as well as a bit of troubleshooting. I would advise to capture debugs from the following KB:
https://community.fortinet.com/t5/FortiGate/Troubleshooting-Tip-IPsec-VPNs-tunnels/ta-p/195955
If live troubleshooting is needed, I would recommend opening a ticket with TAC.
Cheers
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