I have build two node (SLES for VMWARE 11) HA cluster, when both nodes live on same ESX host, everything works perfect.

When I migrate (Vmotion) one node to other ESX they lose connection. We have other clusters in same environment without problems.
They are in same subnet without firewall between, I also try in different ESX cluster so I'm pretty sure it's not network related problem.

What can be wrong that they lose connection when they are on different ESX servers?