NoMachine disconnecting and logging out

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    I started using NoMachine to access virtual machines in my home lab. I have an issue: it suddenly “disconnects” and I can’t find a reason.

    I can’t find a way to reproduce the issue, but this is how it usually goes:

    1. I am using the VM normally.
    2. The screen freezes, and I can move the mouse but I can’t click or type.
    3. A few seconds later it jumps back to the Debian login page.

    Every time this occurs I lose everything I was working on because it logs me out, which closes every window.

    I have tested if it disconnects because of a lack of resources (memory or CPU), but it doesn’t seem to be the reason. Both are close to each other, wired to the router, and in the same network. I wouldn’t say it’s connection issues.

    There are two questions I’d like to make:

    1. Does anyone know anything I could try that would help me find the root cause?
    2. Is there a way to log into existing sessions using NoMachine, so that when I get logged out I don’t lose everything? It seems NoMachine logs out because it lost connection.


    • Both are using NoMachine 8.6.1
    • The client is a MacOS (latest)
    • The server is Parrot OS (Debian 11)

    It looks similar to this problem:

    Xorg crashes after certain events sequence

    Please check if setting the following key in node.cfg helps:

    DisplayServerExtraOptions "-eventdelay 0"


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