By default Terminal Server and Windows 2000 Terminal Services uses TCP port 3389 for client connections. Microsoft does not recommend that this value be changed. However, if it becomes necessary to change this port, follow these instructions.

WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

To change the default port for all new connections created on the Terminal Server:

1.	Run Regedt32 and go to this key: HKEY_LOCAL_MACHINESystemCurrentControlSetControlTerminal ServerWinStationsRDP-Tcp NOTE: The above registry key is one path; it has been wrapped for readability.
2.	Find the "PortNumber" subkey and notice the value of 00000D3D, hex for (3389). Modify the port number in Hex and save the new value. To change the port for a specific connection on the Terminal Server: • Run Regedt32 and go to this key: HKEY_LOCAL_MACHINESystemCurrentControlSetControlTerminal ServerWinStationsconnection NOTE: The above registry key is one path; it has been wrapped for readability.
3.	Find the "PortNumber" subkey and notice the value of 00000D3D, hex for (3389). Modify the port number in Hex and save the new value. NOTE: Because the use of alternate ports has not been fully implemented for Terminal Server 4.0, support will be provided as "reasonable effort" only, and Microsoft may require you to set the port back to 3389, if any problems occur.

To Alter the Port on the Client Side

1.	Open Client Connection Manager.
2.	On the File menu, click New Connection, and then create the new connection. After running the wizard, you should have a new connection listed there.
3.	Making sure that the new connection is highlighted, on the File menu, click Export. Save it as name.cns.
4.	Edit the .cns file using Notepad changing "Server Port=3389" to "Server Port=xxxx" where xxxx is the new port that you specified on Terminal Server.
5.	Now import the file back into Client Connection Manager. You may be prompted to overwrite the current one, if it has the same name. Go ahead and overwrite it. You now have a client that has the correct port settings to match your change Terminal Server settings.

NOTE The Windows 2000 Terminal Server ActiveX client connects only to TCP port 3389. This configuration cannot be changed. The Terminal Server ActiveX client that is available in Microsoft Windows XP and in Microsoft Windows Server 2003 supports the ability to modify the port settings. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
NOTE: You must restart the Terminal Server before the new listening port becomes active, or recreate the RDP listener via Terminal Services configuration.