We have 2 clustered SQL instances (2 physical servers in each cluster). Instance2 needs to be setup as a linked server on Instance1.
At this time port 1433 between them is not open. I am referring to the port on the network switch, not in the Windows Firewall (ports in Windows Firewall are already open).
Is opening the port between virtual IP-s sufficient? Or does port need to be open between all physical source/destination IP-s as well?