Steps to change default RDP port 3389 on windows

1. Start Registry Editor. (start->Run->regedit)

2. Locate and then click the following registry subkey:   
           HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\TerminalServer\WinStations\RDP-Tcp\PortNumber

3. On the Edit menu, click Modify, and then click Decimal.

4. Type the new port number, and then click OK.


5. Quit Registry Editor.