Although Remote Desktop Services server is using the default listening port of 3389 TCP and UDP, it’s possible to modify or change the listening port of Remote Desktop to another port. It’s especially useful when the remote computer is behind firewall which doesn’t allow incoming and outgoing connections other than standard ports (Windows Firewall in Windows XP Service Pack 2 (SP2) or later will automatically configure and open required ports when user enable Remote Desktop to allow Remote Desktop connections to the computer, if “Don’t Allow Exceptions” is not selected. Else, user will need to manually open the Remote Desktop port in Internet Connection Firewall on Windows XP SP 1 or earlier), or users unable to configure the port forwarding for Remote Desktop if they’re behind firewall or router’s NAT.
How to Change the Listening Port for Remote Desktop
Microsoft has a Knowledge Base article KB306759 that details how to modify and change the Remote Desktop listening port by changing registry value.
- Start Registry Editor by clicking on Start -> Run, and type in regedit in the Run text box, and then press Enter or click OK.
- Navigate to the following registry branch/subkey:
- Locate the registry entry PortNumber in the right pane.
- Right click on PortNumber and choose Modify (or select PortNumber, then click on Edit menu and select Modify).
- On the Edit DWORD Value window, click on Decimal.
- Type in the new port number on the Value Data text box.
- Click OK when done.
If you don’t want to mess or modify in the Windows registry yourself, IntelliAdmin has a small free utility tool Remote Desktop Port Change (RDPRemotePortChange.exe) that allows users to change the Remote Desktop listening port on local computer or on remote computer across the LAN.
To change listening port for Remote Desktop for local PC (the computer that you’re using now), simply select Local System, or select Remote Computer for other computer and key in the desired computer name or IP plus authentication user name and password to change the listening port. Configure the required settings i.e. the new port number for Remote Desktop, and whether to reboot the PC after the change, and simply press Submit.
Note that Remote Assistance feature in Microsoft Windows XP may not work correctly if the the listening port of Remote Desktop has been changed. Beside, when want to connect or remote control this particular computer with non standard listing port by using the Remote Desktop connection from remote computer, the port number must be specified together with computer host name or IP address to connect to that specific port.