Finally found it!
Sql Server Configuration Manager >
Sql Native Client Configuration > Client Protocols
> double-click (e.g. ) TCP/IP.
"Default port" is top item.
The server has it's own settings
See
ms-help://MS.SQLCC.v9/MS.SQLSVR.v9.en/udb9/html/2276a5ed-ae3f-4855-96d8-f5bf01890640.htm
under "How To" in sql BOL
Bill