Sometimes after performing a Firmware upgrade on FortiGate HA pairs, I find that after sometime the cluster still stays out of sync and won’t synchronise. I usually find this is because the checksums of the config files on each or some members are different. To quickly check if this is the case, fire up the CLI and run the following command that will output the HA checksum.
# diag sys ha checksum cluster
If the output don’t match and we’re happy with the configuration of the primary we can issue a checksum recalculate by issuing the following command
# diag sys ha checksym recalculate
Just entering the command without options recalculates all checksums. You can specify a VDOM name to just recalculate the checksums for that VDOM.
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