Notifying the client when the remote session is terminated without user's intervention

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FR dismissed. It's an old duplicate of 

https://www.nomachine.com/backend/features/view.php?fr_id=12630&id=FR02S04073

Notifying the client when the remote session is terminated without user's intervention

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This Feature is the server side counterpart of: https://www.nomachine.com/FR05E01716

In some situations users' sessions are terminated cleanly without their interventation, for example when

1) The administrator terminates the user's session.

2) The user's is connected to the desktop of another user and the desktop owner terminates that session.

The server should detect such conditions and inform the client before that the session terminates. With such information the client is able to show a message to the user to explain why the session has been closed.

The case of reboot/shutdown of NoMachine server or its host is tracked here: https://www.nomachine.com/FR08O03489