Hey everybody,
in the security Tab I checked the checkbox which sais that Administrators can not open a web session.
But even if I connect directly to the console and login as admin I do get automatically logged off after a few seconds. This issue does not occur every time. When I log in the second time or if I used another user prior it sometimes works. There seems to be a bug.
About Remoredesktop Users:
If you deacticate that only users of the RDP user group can open a session the principal "Everyone" gets added to RDP users. You should NOT do this! This is insecure. Or change the desciption of the checkbox to "Grant access to anybody". This would be a better description.
BR,
Filz