If you use ASGRD 2015 to log on to a server where you are not granted login access, the tab / connection just disappears after providing credentials - no error in a popup or in Status Messages.
If you log on using regular mstsc you get a "The connection was denied because the user account is not athorized for remote login".
If you log on using regular mstsc you get a "The connection was denied because the user account is not athorized for remote login".