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Trouble report closed. This issue cannot be reproduced in version 8.10.1, it is recommended to upgrade your NoMachine installation.

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Sometimes on the Debian 11 server host with enabled "Lock the physical screen on disconnect" the screen is not locked after the user disconnects from the connected session on Debian 11.

In the logs we can see:

12960 12960 2022-02-11 11:45:39 403.788 NXNODE   WARNING! Lock screen command finished with error 'Error org.freedesktop.DBus.Error.NotSupported: This method is not implemented\n'.
12960 12960 2022-02-11 11:45:40 915.432 NXNODE   WARNING! Process '/bin/dbus-send --type=method_call --dest=org.gnome.ScreenSaver --print-reply --reply-timeout=1500 /org/gnome/ScreenSaver org.gnome.ScreenSaver.Lock' with pid '14155/14155' finished with exit code 1 after 1,509 seconds.