Remote Desktop Disconnected

From my Windows 2000 server when I try to connect to any of my Window 2000 Servers they work just fine. When I try to connect to any Windows 2000 Prof. computers I get the following error listed below. These 2000 Prof. computers are all SP4 and have Remore Desktop Connection Client Installed. I have no prolem with my XP Prof. clients it’s just on 2000 clients:
“remote connections might not be enabled or the computer might be too busy to accept new connections. It is also possable that network prolems are preventing your connection”

If I get on a Windows 2000 Prof. computer and try to connect to other Windows 2000 Prof. computer it works fine ? ? ?