KDE Wayland disconnects immediately after login

[jaburjak]

Hello, I’m using the latest version of NoMachine free to connect from Windows to my Arch Linux laptop. The desktop environment is KDE Plasma 5.25.5 running on Wayland. About a year ago, I was able to connect to my physical display just fine, but then it started failing and I still weren’t able to resolve it.

I’m able to login to the remote machine, it even displays the balloon message that a new user has connected, but I can’t see the remote desktop in the client (not even a black image, it is white like it’s loading) and after approx. three seconds, the client gets disconnected. I do have PipeWire installed, including xdg-desktop-portal-kde and I’m able to share my screen in other applications.

This is what nxserver.log says (I’m using SSH to tunnel port 4000, that’s why its showing ::1 as the remote IP, but if I open the port in the firewall and connect directly, the result is the same):

4736 4736 2022-09-22 21:21:48 929.686 NXSERVER Starting LS 8.0.168 and services.
4736 4736 2022-09-22 21:21:48 929.750 NXSERVER System information: ArchLinux, standalone.
5005 5005 2022-09-22 21:22:12 674.820 NXSERVER Connected from remote machine ‘::1’ using protocol ‘NX’.
5005 5005 2022-09-22 21:22:18 288.786 NXSERVER User ‘jaburjak’ logged in from ‘::1’ using authentication method NX-private-key.
4736 4736 2022-09-22 21:22:18 497.329 NXSERVER WARNING! Cannot check WM on display :1 EEXIST
5005 5005 2022-09-22 21:22:24 968.190 NXSERVER User ‘jaburjak’ from ‘::1’ logged out.
5005 5005 2022-09-22 21:22:24 968.562 NXSERVER Remote machine ‘::1’ disconnected.
4736 4736 2022-09-22 21:22:25 426.321 NXSERVER WARNING! Session 2C5C4E9D680C208EBED9889E3B31D45D crashed on display 1.

This is what nxerror.log says:

Info: Handler started with pid 5005 on Thu Sep 22 21:22:12 2022.
Info: Handling connection from ::1 port 56870 on Thu Sep 22 21:22:12 2022.
unable to link authority file /usr/NX/var/tmp/nx, use /usr/NX/var/tmp/nx-n
Authorization required, but no authorization protocol specified
Authorization required, but no authorization protocol specified
4736 5044 2022-09-22 21:22:18 497.170 HostWmRunningHelper: WARNING! Failed to open display ‘:1’.
Info: Connection from ::1 port 56870 closed on Thu Sep 22 21:22:18 2022.
Info: Handler with pid 5005 terminated on Thu Sep 22 21:22:18 2022.

I tried rebooting the remote machine and connecting before logging in, in this case, I can see the login screen (SDDM) in the NoMachine client, but after I log in, the client gets stuck on the login screen and does not show me the desktop session.

I tried connecting with WaylandModes compositor,drm and WaylandModes drm,compositor, to no avail. If I run nxserver –eglcapture yes, I get an error saying NoMachine can’t find any display manager script.

If anyone could help me to get NoMachine working again, I would really appreciate it. Thanks!

[Britgirl]

Hi, if you are running Wayland in a VM, try the tips here:

Connecting to a Wayland-based desktop running in a Linux virtual machine
https://kb.nomachine.com/AR04R01083

You could also consider using X.org instead of Wayland like this user https://forums.nomachine.com/topic/connecting-arch-desktop-to-arch-laptop-got-error-104#post-39945

[jaburjak]

Thank you, I’m running Wayland on a physical computer and trying to connect to the physical display. Logging in to X.org works fine, but I would prefer Wayland, if some future version of NoMachine will support it.

[Britgirl]

I would prefer Wayland, if some future version of NoMachine will support it.

NoMachine already supports Wayland 🙂 It has done since version 6. But given there are some limitations with desktops on Wayland in general, this will affect the remote desktop experience as well.

Please see here:

Notes for connections to Linux physical desktops running Wayland
https://kb.nomachine.com/AR02P00969

Can you send us the logs of the Ubuntu server? Please see the following document for instructions and submit them here or send to forum[at]nomachine[dot]com, making sure to use the topic’s title as the subject of your email. Thanks!

https://kb.nomachine.com/DT07S00243

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