Remote Desktop Disconnected Because of an error in data encryption

I am lab admin in university and I am using Window server 2003 at server, and I am using Window XP 2006 at client PC’s now I am trying to connect the server through client machine and I am doing this work through Remote desktop connection.
When I give IP and connect it then I receive successful connected message but after some time it shows me a message of Remote desktop Disconnection.

Remote Desktop Disconnected
Because of an error in data encryption, this session will end. Please try connecting to the remote computer again.
