Case on my customer, when I enable HA on DMZ Cluster, I get this error “Issue detected on esx.vmware in HA: Could not reach isolation address: none specified”.
They have 8 ESX Server 3.5 Update 2 dan 1 vCenter 2.5 Update 3.
1. Check your Service Console Default Gateway on that host. Ensure you have the right IP for Gateway.
2. Re-enable HA on that host.
Hopefully this help.