Black screen connecting to Rocky Linux 9

[rocky9_nomchine]

Installed NoMachine x86_64 9.1.24-6 on host and client.

Host is Rocky linux 9, with two monitors attached.

gnome-shell.x86_64   40.10-25.el9_6

5.14.0-570.28.1.el9_6.x86_64 #1 SMP PREEMPT_DYNAMIC Thu Jul 24 10:32:22 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux

Client is Windows 10.

I can connect the host,  can see mouse cursor changes its shape to match from the host, but the screen is black.

Debug log file is attached.

Attachments:

1. rocky9_black_screen.zip

[Bilbotine]

Hello rocky9_nomchine,

Thanks for the logs, we checked them, but we need more info. Can you please

• restart the server (/usr/NX/bin/nxserver –restart) and collect debug logs again as you already did (so that also the logs from the server daemon will be included)
• give us the output of ‘ps -ef’
• check whether the monitors are turned on and display is not sleeping

[rocky9_nomchine]

Sure thing. Here they are. I performed a logrotate before restarting. I can also confirm that the server display was on at all times; it was not sleeping or suspended.

In fact, after connecting from a Windows client, I can see the NoMachine note on the top right corner of the Linux host stating a user ‘username from IP xxx connected, a second note also states “Your desktop is currently viewed”. But the client NoMachine window remains blackscreen, the mouse cursor, however, changed its shape to match the host.

Attachments:

1. rocky9_black_screen2-1.zip

[rocky9_nomchine]

Here’s the ps output (it won’t let me post file with extension .log), so here it is the ps -ef outout:

Attachments:

1. ps_output.txt

[Britgirl]

We were able to reproduce this and opened a Trouble Report, here’s the link you can use to monitor its status: https://kb.nomachine.com/TR10W11586.

[Britgirl]

Please update to version 9.3 which we just released. Thanks!

[rocky9_nomchine]

9.3.7.1 solved the black screen issue when connecting a Rocky Linux remote host from a Windows 11 Client.

However, the performance is so bad that it is unusable. I’ll create a another post about this new issue.

[Author]

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