WINDOWS 7, Remote Desktop works fine with two 2003 servers but not the 3rd?

Remote Desktop is working fine with my DC server, as well as my DCHP server but not with my file server???

The machines I rdc to are all windows 2003 enterprise servers.

In vista and xp I can rdc with no problems connecting to my file server.

Windows 7 gives me this error–>

“Because of a protocol error, this session will be disconnected. please try connecting to the remote computer again”

I don’t get it, anyone else seen this