Remote display frozen at connection

[truc113]

Hi all,

I’ve been using NoMachine to connect to my work computer which is accessible only through a vpn, my work computer runs xubuntu 24.04 and my home computer runs xubuntu 22.04, both have NoMachine 9.1.24, display manager (lightdm) is disabled so I can connect to remote desktop with the resolution I want (big screen at home, tiny screen at work), ie. I’m using option 1 of https://kb.nomachine.com/AR03P00973.

Recently the vpn was updated to allow only RDP connections (most of coworkers are on Windows), ie. port 3389 only, not even SSH.

I thought i had prepared correctly for that by making NoMachine server on work’s computer use port 3389 with NX protocol, which was perfectly fine until the vpn update. Since then I can connect to remote display apparently successfully but the display is frozen, I can see the mouse cursor changing depending on whether it’s on text, clickable stuff etc, I can type and and run commands but the display does not change at all (I don’t see what I type or the result of any click), I have a clock with second-precision in my taskbar and it shows time of connection and never changes (like the rest of the display).

If I disconnect/reconnect I still have a frozen display but at least it shows the “updated” version of my remote desktop with the result of all “blind” actions I performed in previous connection ie. if I had closed a window or typed a command in previous connection I can now see the result of it.

Any idea ?

Regards,
J

[Britgirl]

Hi, you could try disabling UDP. You do that in Edit connection (Right click the connection in Machines )-> Configuration -> Use UDP communication for multimedia data, and uncheck the box there. Then try to connect.

If that doesn’t help, we need to see the logs from both computers.  You can extract them using the instructions here: https://kb.nomachine.com/DT08U00298#1 and #1.2.

Send them to forum[at]nomachine[dot]com. Please use the title of this topic as the subject of your email. Thanks!

[truc113]

Hi, Idid try that but it did not change anything, next time I’m at the office I’ll test again using my phone as client and gather logs on both sides.
By the way is it not possible to attach logs directly in this thread?

[Britgirl]

You can also attach them here, yes. Bear in mind that they will be in the public domain.

[truc113]

Hi, I just sent server and client logs for a connection which still has the issue. I had the issue with and without UDP (no change), logs are for UDP on, also I was not in headless mode this time as I had the server at hand, NoMachine client was showing to a new display which was frozen, as in headless mode, disconnect+reconnect showed the result of 1 connection (few windows opened) but still frozen, iirc the logs are for a 1st connection after a server restart.

[Bilbotine]

Hi truc113,

We could send you a debug version, but in order to understand exactly what is needed, can you please tell us if you also have the the problem when connecting from the desktop client for Linux and not only when connecting from the Android phone ?

Can you also send us the logs from the desktop client ?

[truc113]

Hi, the same problem occurs when connecting from linux desktop client, and also when connecting from android client (the logs I sent were from android).
It’s going to be difficult to get linux desktop client logs though unless I can use a spare pc at work to try to connect to my host.
from home I’d rather not try again as it makes my work computer almost unusable, I was lucky enough last time to have a terminal already up and then able to install xrdp as a backup…

[Bilbotine]

Hello truc113,

You wrote it would be hard for you to install a debug version on the Linux client; would you then be available to install a debug package on the Android client? Or, alternatively, a debug package on the server?

Thank you for your feedback.

[truc113]

Hi,

I would in fact have trouble finding a linux client available at my work, but I should be able to install a debug package on my work computer (the server) and/or on my phone (android client), I can do both if needed.

[Author]

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