Many friends don't know that WinXP can change the default port of remote desktop through the registry, so I'll try it today! How to modify the default connection port of WinXP remote desktop: 1. The default port of Remote Desktop Terminal Service is "3389". In order to prevent others from maliciously connecting, you need to change the default port. To do this, you can open the registry editor and click HKEY _ local _ machine \ system \1,where the "current control set \ control \ terminal server \ WDS \ rdpwd \ TDS \ TCP" branch, and the key value of "port number" under it corresponds to the port number, so you can modify it. After the above settings are completed, you need to branch "HKEY_LOCAL_MACHINE\SYSTEM\2" in turn, in which the current control set \ control \ Terminal Server \ winstates \ RDP-TCP "needs to be changed, and the key value of" PortNumber "under it needs to be changed. 2. After changing the remote login port of the server, you can set the address of the connection server in the local "Remote Desktop Connection Program", and then click "Connection Settings → Save As" to export and save the connection file. Then use Notepad to open the exported *s file. After opening, you can find the statement "server port =3389" in it, and change its default "3389" port to the same login port as the server. After modifying the WinXP remote desktop port, we can use the modified port number to connect to this computer with other computers. The original 3389 port number will not exist because of modification. In order to protect computer privacy, I suggest that you learn to modify the port number.