vSphere HA Configuration fails: Operation Timed Out

I recently rebuilt my lab and added 2x new ESXi hosts, I re-used my old single host in the process which I upgraded from ESXi 5.5 to 6.0 and patched to the same level as the new hosts. Everything was working as expected until it came for the time to enable HA. My old host claimed the master roll and thus the other boxes had to connect to it as slaves, however, these failed with “HA Agent Unreachable” and “Operation Timed Out” errors....

July 22, 2015 · Myles Gray