After firmware upgrade from v.19 to v.20, HA failed to work and currently we are running on one FW.
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Hi eFrancis,
I had the same issue after the upgrade to v.20. In my case, the IP of the auxiliary appliance was reseted to the default value (172.16.16.x or something like this). After changing the IP to the right value, HA worked fine again.
I hope that this information helps.
Best regards