How to Setup the Remote Desktop Port
- 1). Click "Start" then type "regedit" in the search bar.
- 2). Press "Enter."
- 3). Use the "+" symbols on the left side of the Registry Editor window to go to the "HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\TerminalServer\WinStations\RDP-Tcp\PortNumber" port.
- 4). Right-click the port, click "Edit" then choose the "Decimal" option.
- 5). Type in the port you want to use then click "OK" to set it up.
Source...