I have a 2012 SQL server that was setup by a third-party and is used to host some demo data for a new bit of software their selling our mutual client.
It was a agreed that we could share this server so I have recently installed a new SQL instance for use with our 2012 RDS farm.
To get both working on port 1433:
- Added an additional IP to it's primary NIC (removed "register this connection in dns").
-Disabled "Listen on all adaptors" in TCP/IP protocol settings for the default instance.
-Enabled IPv4 address (was just set as active).
-Disabled Listen all and removed "0" from default ports for new instance.
-Enabled new IPv4 address.
Everything seemed fine. SQL Server Manager is okay, their software and my RDS connect are working (remote connections to SQL).
The issue is one of their engineers tried to open the database from the local SQL server...