How to Change Remote Desktop Listening Port

You can change the Remote Desktop listening port on a computer by editing the following registry entry:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\TerminalServer\WinStations\RDP-Tcp\PortNumber

You may want to do this if you have more than one computer on your network that you’d like to allow access to Remote Desktop through the router/firewall.

You’ll need to allow access to the computer via Port Forwarding in your router/firewall.  If you’re using a software firewall on your computer (i.e. Windows Firewall) you will also need to allow access through the firewall for the new port.  Changing this port does not automatically change the firewall rules.

More information can be found at this link:
http://support.microsoft.com/kb/306759