Problem with restore and different "clients"

[Chris Steinewski]

Hi all,
I have a problem with Guacamole. When I try to restore a running RDP session 
started with Guacamole using the Windows RDP client, it doesn’t work. The 
session just ends. I have to close all processes running as the user, then I 
can establish a new session with the Windows RDP client. It’s the same the 
other way around. If a session is started with Windows RDP, I can’t ‘take over’ 
the session with Guacamole. Is this a known issue and is there a solution?
 
TiA
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Greetz