How to configure SQL Server Port on multiple instances?
have fixed sqldwdev01
the reason I couldn't connect to UAT
instance is because of a couple of reasons


there was a dynamic port specified for the instance under SSNetworkConfig\Protocols for UAT, so had to remove that and specify 1435 (as 1434 is in use) then restart the service
still cant connect remotely to the instance name but can connect using the port name eg sqldwdev01,1435 so it needed sql browser service to be running to direct the port for connecting with instance name


i started sql browser and now  can connect using sqldwdev01\uat