I enabled HA on a new cluster the other day and one of the hosts came back with the following error:
Cannot complete the configuration of the HA agent on the host. Misconfiguration in the host network setup.
On ocassion, I have seen weird HA errors where simply selecting the ‘Reconfigure for HA’ on the host fixed the issue. I tried this, but the same error was seen. I next selected the host and went to Tasks & Events – Events. From there, I found the following error message:
HA agent on <host> in cluster <cluster> in <datacenter> has an error: Cannot complete the HA configuration.
Selecting the message and under Related Events selecting Show displayed:
Host <host> has the following extra networks not used by other hosts for HA communication: <IP>,.
Consider using HA advanced option ads.allowNetworkto control network usage.
Looking at the VMkernel interface, everything appeared to be configured correctly. I ensured the IP configuration was correct and that no duplicate IP issue was being experienced. So what was causing the problem?