There’s always that time when you need desperately to get into your home computer from work, be it to get financial or tax information or just to kick off a download of that great movie your buddy just told you about. Most of us bound behind the corporate firewall can’t get to much of anything outside of 80 or 443 as far as ports go, besides that a lot of us don’t even have rights to install new software on our computers. So we need a hack that doesn’t require any installation on our work computer, but will allow most of us to terminal into our home computer.
The hack is to allow a remote desktop connection to your computer over port 443, which is the standard http ssl port, and is typically left open for internet browsing by the sys-admin. The hack should work on most Windows 2000/XP/Vista machines. This hack will not work if you’re serving up an SSL website out of your house. Keep in mind this hack requires editing the registry and if you don’t know what your doing or modify the wrong key it could severely trash your computer, please perform at your own risk.

Remote Desktop is a multi-channel protocol that allows a user to remote access or connect to a computer which has enabled Remote Desktop server from another remote computer, through Local Area Network (LAN), Wide Area Network (WAN) or Internet by using Remote Desktop Connection client program. Microsoft Remote Desktop Protocol (RDP) server application can be found pre-installed on Windows Server 2003, Microsoft Windows XP Professional, Microsoft Windows XP Media Center Edition (MCE), Microsoft Windows XP Tablet PC 2005 Edition, Windows Vista Ultimate, and Windows Vista Business Edition. By default, Remote Desktop is using port 3389 TCP (UDP to stream audio redirection) as the listening port for any incoming Remote Desktop connections.


Although Remote Desktop 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. ALSO READ MY PREVIOUS POST ON REMOTE DESKTOP.
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) 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.




Microsoft has a Knowledge Base article KB306759 that details how to modify and change the Remote Desktop listening port by changing registry value.
 
1.Start Registry Editor by clicking on Start - Run, and type in regedit in the Run text box, and then press Enter or click OK.

2. Navigate to the following registry branch/subkey:

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

3. Locate the registry entry PortNumber in the right pane.
4.Right click on PortNumber and choose Modify (or select  PortNumber, then click on Edit menu and select Modify).


5. On the Edit DWORD Value window, click on Decimal.

6. Type in the new port number on the Value Data text box.

7. 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.