if Windows Serer 2012 (R2) is configured in RDP Administration mode, which is the default, it is no more possible to connect to a other users remote desktop session with the GUI “Remote Desktop Services Manager”. Microsoft has removed this tool and do not provide an equivalent replacement.
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when a RDP sessions hangs there are multiple ways to destroy it. The command line way:
Identify the RDP Session ID. Use quser
USERNAME SESSIONNAME ID STATE IDLE TIME LOGON TIME
winuser rdp-tcp#6 2 Active 3 24.09.2014 22:26