We moved a SQL 2005 DB to a SQL 2008 R2 server. When we did that we also swapped the servers names and IP addresses so that our applications would not have to be updated to point to a diffent database server name.
We do not use standard ports, so the new server has SQL listening on the same port as the old server.
Since the move, we cannot connect to the new DB server using the port number (i.e. DBServer1,33401) but we are able to connect using the named instance (i.e. DBServer1\PROD) I cannot even connect to the server using telnet so it does not look like the server is listening on the port SQL is on.
We do not have firewalls implemented on the servers and our firewall team has told me that the firewalls in the environment are not blocking the connection attemps. That makes sense since we are using the same port number and IP addresses as before.
Any ideas on the reason we cannot connect using the port number?