When you reboot your server, or you have too many connections on the server.

The Terminal Services start to give you this errors on the Application Event Viewer:

Event Type: Error
Event Source: Winlogon
Event Category: None
Event ID: 1219
Date: 30/10/2006
Time: 16:04:02
User: N/A
Computer: MENKIB
Description:
Logon rejected for Domain\xxxuser. Unable to obtain Terminal Server User Configuration. Error: The RPC server is too busy to complete this operation.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: bb 06 00 00 »…
There is a HotFix for this error in the KB 905700
And yes, the hotfix works :)

Any thanks or questions enter in our forum, we always try the do the best in helping you :)