I upgraded a HA cluster over the weekend of Fortinet 600D firewalls. I was upgrading in three steps as below:
Step 1 - Upgrade from 5.4.11 to 5.6.11
Step 2 - Upgrade from 5.6.11 to 6.0.9
Step 3 - Upgrade from 6.0.9 to 6.2.4
The first two steps went very smoothly, but the final step involved a messy reboot after both nodes were upgraded. During the cluster reboot, I lost all connectivity and was contemplating getting remote hands involved. After around 10 minutes, the device thankfully came back online.
Is this normal? Should I be wary of using version 6.2.4?