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FortiGate Cluster out-of-sync
FortiGate Cluster in A-P.
I noticed that there is a mismatch in vpn.ipsec.phase1-interfaces on FW02.
I tried to delete the tunnel in CLI FW02 but encountered an error.
FG60FFW02 (phase1-interface)# delete fg-ipsec-101
Can not delete a static table entry
Command fail. Return code -61
Tried also re-calculated checksums but issue persists.
Any recommendations to make this works is highly appreciated.
TIA :)
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FortiGate
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Try to edit the second node's IPsec config to match with the first node.
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If you're 100% sure the "fg-ipsec-101" is not referred from anywhere (check with "show | grep -f fg-ipsec-101"), reboot the secondary FW02.
This unsync problem happens time to time in our multiple HA clusters (hasn't happened yet after upgrading to 7.2.8 though) and rebooting the secondary regularly solve the problem. I think when the IPsec's config was changed or removed at the primary the secondary's config in the memory goes into a questionable state during sync and can't quite recover itself. It would clear and reestablish in the memory when it's rebooted.
Toshi
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The following article is a good one to troubleshoot your issue.
https://community.fortinet.com/t5/FortiGate/Technical-Tip-Correcting-an-out-of-sync-HA-cluster-by-mo...
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You can download the config from the primary and search for fg-ipsec-101 to check for references. As recommended, if there are no references for the mismatch try rebooting the firewalls