By defauly Windows XP Remote Desktop port number is 3389
Some reason you decided to change the port number for RDP (but this has security implications ie do you want a remote desktop session open on port 3350 on your home or corporate PC)
If you want to change the port number
WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. take a backup of your registry before doing any changes
You can use the Remote Desktop feature in Windows XP Professional to connect to your computer from another, remote computer.
WARNING: The Remote Assistance feature in Windows XP may not work properly if you change the listening port. To change the port that Remote Desktop listens on
Start>run type regedit click ok
Navigate the following key in the registry from left pane
On the Edit menu, click Modify, click Decimal, type the new port number, and then click OK.
close Registry Editor.
NOTE: When you try to connect to this computer by using the Remote Desktop connection, you must type the new port.
You need to make sure your firewall is opened for this port.