I've read many posts on many forums that say you can do this. But it's always an older version of SQL server. (like this one https://social.msdn.microsoft.com/Forums/sqlserver/en-US/8d2a2fbb-f08e-4eba-84ea-00c0d9bc8efb/how-to-configure-2-instances-on-same-hardware-with-same-port?forum=sqldatabaseengine )
I've tried all this but still can't get the second instance to start. The error I get is . . .
TDSSNIClient initialization failed with error 0x57, status code 0x1e. Reason: The SQL Server Network Interface found a duplicate IP address in the SQL Server TCP listening settings. Remove the duplicate IP address by using SQL Server Configuration Manager. The parameter is incorrect.
Was this only possible on SQL 2005?