Server freezes after client disconnection

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    I have a problem, that I can reproduce every time. My server is Ubuntu 18.04 MATE, NoMachine 6.9.2-1, Nvidia GTX 710 with proprietary drivers (440.82-0ubuntu0~

    The problem itself is simple: when I disconnect a client, the server freezes.

    It’s not a system freeze, but I don’t get back the control of the desktop. The cursor moves around when I move the mouse, but I can’t click, and the keyboard doesn’t have any effect.

    I can switch terminal via Ctrl+Alt+F1. I can reconnect another time with a client, and the remote connection works.

    The only way to be able to use the server again is to kill the desktop session (in my case, pkill mate-session). Stopping the NM service (systemctl stop nxserver) doesn’t get control back.

    I’ve tried disablling the GPU acceleration, but it doesn’t have any effect.




    Perhaps the culprit here is the lock screen. On the remote host you are connecting to, please check if in the client –monitor options you have the “Lock the physical screen on disconnect” option selected.

    Right click the system tray icon -> Show the service status -> Server preferences -> Security, last option on the bottom. If yes, please turn it off, restart the nxserver:

    sudo /etc/NX/nxserver --restart

    and check if it still is happening.

    If it’s not checked, please provide logs so we can investigate.

    The article on how to collect logs: (“How to gather debug logs for support requests”)

    Please send the logs to forum[at]nomachine[dot]com using the title of that forum’s thread as the mail’s subject.



    Hello! I’ve incidentally upgraded to Ubuntu 20.04, and the problem doesn’t show up anymore (at least, based on a few connections, although before it was always happening). Thanks for the reply!

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