Kick Remote Desktop (RDP) user

You try to RDP onto a machine but get this error:

The simplest way to remove an idle connection (Windows 2003):

1) log into a machine on the same network
2) select the Terminal Services Manager (or Start->Run tsadmin.exe)

3) right click on network in left pane, select "Connect to Computer".  Enter required IP or hostname
4) right click on user in right pane, select "Log Off"