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After an upgrade to Fedora 41, I can no longer connect to NX. I can see this in my server log:
Info: Handler started with pid 28156 on Thu Jul 31 10:01:32 2025.Info: Handling connection from 10.11.18.161 port 63151 on Thu Jul 31 10:01:32 2025.
28156 28156 2025-07-31 10:01:33 281.551 NXSERVER Connected from remote machine '10.11.18.161' using protocol 'NX'.
28156 28156 2025-07-31 10:01:33 281.604 NXSERVER Process initialized with arguments '-c /etc/NX/nxserver --login -H 11'.
28156 28156 2025-07-31 10:01:33 701.377 NXSERVER User 'pupu' logged in from '10.11.18.161' using authentication method NX-password.
Info: Connection from 10.11.18.161 port 63151 closed on Thu Jul 31 10:01:36 2025.
Info: Handler with pid 28156 terminated on Thu Jul 31 10:01:36 2025.
27397 27397 10:01:36 982 nxexecPAMCloseSession: Pam transaction must be provided
26809 26809 2025-07-31 10:01:36 985.244 NXSERVER WARNING! Process '/usr/NX/bin/nxexec --node --nopam --user root --priority realtime --mode 0 --pid 50' with pid '27397/27397' finished with exit code 11 after 1511,353 seconds.
26809 26809 2025-07-31 10:01:36 985.385 NXSERVER WARNING! D2BB9C5ACA395A48739E974C379EC502 nxnode died with exit code 11.
28156 28156 2025-07-31 10:01:36 987.527 NXSERVER ERROR! Received error message from node 'localhost:4000', 'Last operation failed.'.
26809 26809 2025-07-31 10:01:37 006.213 NXSERVER WARNING! NXRedis: field ServerStatusDump in command line 'command=hset,service=db,key=running.D2BB9C5ACA395A48739E974C379EC502,field=ServerStatusDump,value=\n' cannot be empty.
26809 26809 2025-07-31 10:01:37 006.321 NXSERVER WARNING! NXRedis: command line 'command=hset,service=db,key=running.D2BB9C5ACA395A48739E974C379EC502\n' cannot set nothing.
26809 26809 2025-07-31 10:01:37 006.370 NXSERVER WARNING! NXRedis: Sending command 'command=hset,service=db,key=running.D2BB9C5ACA395A48739E974C379EC502\n' aborted.
26809 26809 2025-07-31 10:01:37 035.396 NXSERVER WARNING! Session D2BB9C5ACA395A48739E974C379EC502 crashed on display 0.
Info: Handler started with pid 28393 on Thu Jul 31 10:01:37 2025.
Info: Handling connection from 10.11.18.161 port 63165 on Thu Jul 31 10:01:37 2025.
28156 28156 2025-07-31 10:01:37 658.499 NXSERVER ERROR! Status 'Failed' for 'started' session '9FC6E56CE9D7FE33DBEF5CEB06C7D852'.
28156 28156 2025-07-31 10:01:37 673.675 NXSERVER User 'pupu' from '10.11.18.161' logged out.
28156 28156 2025-07-31 10:01:37 674.345 NXSERVER Remote machine '10.11.18.161' disconnected.
Connection failure: Connection refused
pa_context_connect() failed: Connection refused
28372 28372 2025-07-31 10:01:37 729.882 NXNODE WARNING! Process '/bin/pactl info' with pid '28456/28456' finished with exit code 1 after 0,006 seconds.
28372 28372 2025-07-31 10:01:37 729.945 NXNODE Process initialized with arguments ''.
Connection failure: Connection refused
pa_context_connect() failed: Connection refused
28372 28372 2025-07-31 10:01:37 737.215 NXNODE WARNING! Process '/bin/pactl info' with pid '28457/28457' finished with exit code 1 after 0,006 seconds.
28393 28393 2025-07-31 10:01:38 580.292 NXSERVER Connected from remote machine '10.11.18.161' using protocol 'NX'.
28393 28393 2025-07-31 10:01:38 580.331 NXSERVER Process initialized with arguments '-c /etc/NX/nxserver --login -H 12'.
26809 26809 2025-07-31 10:01:38 609.777 NXSERVER ERROR! Cannot send command the server 2D5CB4387E6C99BCAB2D75AF38189A67: session doesn't exist.
26809 26809 2025-07-31 10:01:38 610.232 NXSERVER ERROR! Cannot send command the server 9FC6E56CE9D7FE33DBEF5CEB06C7D852: session doesn't exist.
28393 28393 2025-07-31 10:01:39 027.538 NXSERVER User 'pupu' logged in from '10.11.18.161' using authentication method NX-password.
Info: Connection from 10.11.18.161 port 63165 closed on Thu Jul 31 10:01:39 2025.
Info: Handler with pid 28393 terminated on Thu Jul 31 10:01:39 2025.
28393 28393 2025-07-31 10:01:39 601.761 NXSERVER Remote machine '10.11.18.161' disconnected.
28393 28393 2025-07-31 10:01:39 602.037 NXSERVER User 'pupu' from '10.11.18.161' logged out.
I guess nxexec crashes for some reason, but I don’t know why.
Jul 31 10:01:36 fractal kernel: nxnode.bin[28340]: segfault at 2c ip 00007f2e7a634a6f sp 00007f2e0fffe798 error 4 in libnxdimi.so[34a6f,7f2e7a600000+8a000] likely on CPU 0 (core 0, socket 0)
Jul 31 10:01:36 fractal kernel: Code: 5b c3 90 0f 1f 84 00 00 00 00 00 8b 87 b0 81 00 00 89 06 8b 87 b4 81 00 00 89 02 48 63 87 9c 59 01 00 48 8b 84 c7 38 56 01 00 <8b> 40 2c 89 01 48 63 87
9c 59 01 00 48 8b 84 c7 38 56 01 00 8b 40
…after turning on abrt processing of unpackaged binaries…
Jul 31 10:16:38 fractal abrt-notification[29462]: Process 28372 (nxnode.bin) crashed in X11Poller::getBits(int*, int*, int*, int*, int*, int*, NXShadowColorspace*)()Any idea?
Fedora 41, KDE/Plasma desktop
Thanks
P.U.
Hi, are you able to send us the server-side logs so we can check them? You can extract them using the instructions here: https://kb.nomachine.com/DT08U00298#1.1, by clicking Take logs in Settings > Server > Security. For the moment, no specific debug level is required.
Send them to forum[at]nomachine[dot]com. Please use the title of this topic as the subject of your email. Thanks!
Hi, OK, sent. I have ssh connection to the box, but no graphics, so some remote debugging is possible. Thanks!
P.U.
We got the logs, thanks and we are investigating. Could you try, in the meantime, enabling Wayland instead of using x.Org?
OK, I’ve tried to restart with Wayland session. This time, server logs look different.
112854 112854 15:04:25 550 nxexecPAMCloseSession: Pam transaction must be provided
120830 120830 2025-08-06 15:04:25 557.024 NXSERVER ERROR! Received error message from node ‘localhost:4000’, ‘Last operation failed.’.
26809 26809 2025-08-06 15:04:25 586.159 NXSERVER WARNING! Session 86656584E2EF9C7B3B742F6AF1C3F5C8 crashed on display 0.
Info: Handler started with pid 121107 on Wed Aug 6 15:04:26 2025.
Info: Handling connection from 10.11.18.161 port 52779 on Wed Aug 6 15:04:26 2025.
120830 120830 2025-08-06 15:04:26 082.193 NXSERVER ERROR! Status ‘Failed’ for ‘started’ session ‘AE551119A842FF22635A3B435C56BF11’.
120830 120830 2025-08-06 15:04:26 095.684 NXSERVER User ‘pupu’ from ‘10.11.18.161’ logged out.
120830 120830 2025-08-06 15:04:26 096.287 NXSERVER Remote machine ‘10.11.18.161’ disconnected.
Connection failure: Connection refused
pa_context_connect() failed: Connection refused
121096 121096 2025-08-06 15:04:26 107.792 NXNODE WARNING! Process ‘/bin/pactl info’ with pid ‘121160/121160’ finished with exit code 1 after 0,005 seconds.
121096 121096 2025-08-06 15:04:26 107.869 NXNODE Process initialized with arguments ”.
Connection failure: Connection refused
pa_context_connect() failed: Connection refused
121096 121096 2025-08-06 15:04:26 115.652 NXNODE WARNING! Process ‘/bin/pactl info’ with pid ‘121161/121161’ finished with exit code 1 after 0,005 seconds.
26809 26809 2025-08-06 15:04:26 988.322 NXSERVER ERROR! Cannot send command the server AE551119A842FF22635A3B435C56BF11: session doesn’t exist.
26809 26809 2025-08-06 15:04:26 988.898 NXSERVER ERROR! Cannot send command the server 2D5CB4387E6C99BCAB2D75AF38189A67: session doesn’t exist.
26809 26809 2025-08-06 15:04:26 989.421 NXSERVER ERROR! Cannot send command the server BF7CDBDB9BABE3AFA3070F3754C8BB9F: session doesn’t exist.
26809 26809 2025-08-06 15:04:26 989.921 NXSERVER ERROR! Cannot send command the server 9FC6E56CE9D7FE33DBEF5CEB06C7D852: session doesn’t exist.
121107 121107 2025-08-06 15:04:27 050.213 NXSERVER Connected from remote machine ‘10.11.18.161’ using protocol ‘NX’.
121107 121107 2025-08-06 15:04:27 050.254 NXSERVER Process initialized with arguments ‘-c /etc/NX/nxserver –login -H 12’.
121107 121107 2025-08-06 15:04:27 546.266 NXSERVER User ‘pupu’ logged in from ‘10.11.18.161’ using authentication method NX-password.
Info: Connection from 10.11.18.161 port 52779 closed on Wed Aug 6 15:04:28 2025.
Info: Handler with pid 121107 terminated on Wed Aug 6 15:04:28 2025.
121107 121107 2025-08-06 15:04:28 137.498 NXSERVER Remote machine ‘10.11.18.161’ disconnected.
121107 121107 2025-08-06 15:04:28 137.707 NXSERVER User ‘pupu’ from ‘10.11.18.161’ logged out.
Not much useful info in /var/log/messages, either:
Aug 6 15:04:25 fractal wireplumber[111844]: wp-event-dispatcher: <WpAsyncEventHook:0x555f3670bd50> failed: <WpSiStandardLink:0x555f368b9fe0> link failed: some node was destroyed before the
link was created
Aug 6 15:04:25 fractal systemd[1]: session-c18.scope: Deactivated successfully.
Aug 6 15:04:25 fractal systemd-logind[969]: Session c18 logged out. Waiting for processes to exit.
Aug 6 15:04:25 fractal systemd-logind[969]: Removed session c18.
Aug 6 15:04:26 fractal plasmashell[121215]: Detected locale “C” with character encoding “ANSI_X3.4-1968”, which is not UTF-8.#012Qt depends on a UTF-8 locale, and has switched to “C.UTF-8″ instead.#012If this causes problems, reconfigure your locale. See the locale(1) manual#012for more information.
Aug 6 15:04:26 fractal dbus-daemon[121221]: [session uid=0 pid=121219] SELinux support is enabled
Aug 6 15:04:26 fractal dbus-daemon[121221]: [session uid=0 pid=121219] Activating service name=’org.freedesktop.portal.Desktop’ requested by ‘:1.0′ (uid=0 pid=121215 comm=”plasmashell -v” label=”system_u:system_r:unconfined_t:s0″)
Aug 6 15:04:26 fractal dbus-daemon[121221]: [session uid=0 pid=121219] Activating service name=’org.freedesktop.impl.portal.PermissionStore’ requested by ‘:1.1’ (uid=0 pid=121223 comm=”/usr/libexec/xdg-desktop-portal” label=”system_u:system_r:unconfined_t:s0″)
Aug 6 15:04:26 fractal dbus-daemon[121221]: [session uid=0 pid=121219] Successfully activated service ‘org.freedesktop.impl.portal.PermissionStore’
Aug 6 15:04:26 fractal dbus-daemon[121221]: [session uid=0 pid=121219] Activating service name=’org.freedesktop.portal.Documents’ requested by ‘:1.1’ (uid=0 pid=121223 comm=”/usr/libexec/xdg-desktop-portal” label=”system_u:system_r:unconfined_t:s0″)
Aug 6 15:04:26 fractal dbus-daemon[121221]: [session uid=0 pid=121219] Successfully activated service ‘org.freedesktop.portal.Documents’
Aug 6 15:04:26 fractal systemd[111740]: xdg-document-portal.service: Main process exited, code=exited, status=21/n/a
Aug 6 15:04:26 fractal systemd[1]: run-user-1000-doc.mount: Deactivated successfully.
Aug 6 15:04:26 fractal systemd[111740]: xdg-document-portal.service: Failed with result ‘exit-code’.
Aug 6 15:04:26 fractal dbus-daemon[121221]: [session uid=0 pid=121219] Activating service name=’org.freedesktop.impl.portal.desktop.kde’ requested by ‘:1.1′ (uid=0 pid=121223 comm=”/usr/libexec/xdg-desktop-portal” label=”system_u:system_r:unconfined_t:s0″)
Aug 6 15:04:26 fractal dbus-daemon[121221]: [session uid=0 pid=121219] Activating service name=’org.kde.ActivityManager’ requested by ‘:1.0’ (uid=0 pid=121215 comm=”plasmashell -v” label=”system_u:system_r:unconfined_t:s0″)
Aug 6 15:04:26 fractal plasmashell[121215]: QThreadStorage: entry 8 destroyed before end of thread 0x5652b209d1f0
Aug 6 15:04:26 fractal plasmashell[121215]: QThreadStorage: entry 3 destroyed before end of thread 0x5652b209d1f0
Aug 6 15:04:26 fractal plasmashell[121215]: QThreadStorage: entry 2 destroyed before end of thread 0x5652b209d1f0
Aug 6 15:04:26 fractal kactivitymanagerd[121267]: Detected locale “C” with character encoding “ANSI_X3.4-1968”, which is not UTF-8.#012Qt depends on a UTF-8 locale, and has switched to “C.UTF-8” instead.#012If this causes problems, reconfigure your locale. See the locale(1) manual#012for more information.
Aug 6 15:04:26 fractal dbus-daemon[121221]: [session uid=0 pid=121219] Successfully activated service ‘org.kde.ActivityManager’
Aug 6 15:04:26 fractal xdg-desktop-portal-kde[121255]: Detected locale “C” with character encoding “ANSI_X3.4-1968”, which is not UTF-8.#012Qt depends on a UTF-8 locale, and has switched to “C.UTF-8” instead.#012If this causes problems, reconfigure your locale. See the locale(1) manual#012for more information.
Aug 6 15:04:26 fractal kactivitymanagerd[121267]: Couldn’t start kglobalaccel from org.kde.kglobalaccel.service: QDBusError(“org.freedesktop.DBus.Error.ServiceUnknown”, “The name org.kde.kglobalaccel was not provided by any .service files”)
Aug 6 15:04:26 fractal dbus-daemon[121221]: [session uid=0 pid=121219] Successfully activated service ‘org.freedesktop.impl.portal.desktop.kde’
Aug 6 15:04:26 fractal dbus-daemon[121221]: [session uid=0 pid=121219] Activating service name=’org.freedesktop.impl.portal.desktop.gtk’ requested by ‘:1.1′ (uid=0 pid=121223 comm=”/usr/libexec/xdg-desktop-portal” label=”system_u:system_r:unconfined_t:s0″)
Aug 6 15:04:27 fractal dbus-daemon[121221]: [session uid=0 pid=121219] Activating service name=’org.a11y.Bus’ requested by ‘:1.7’ (uid=0 pid=121347 comm=”/usr/libexec/xdg-desktop-portal-gtk” label=”system_u:system_r:unconfined_t:s0″)
Aug 6 15:04:27 fractal dbus-daemon[121221]: [session uid=0 pid=121219] Successfully activated service ‘org.a11y.Bus’
Aug 6 15:04:27 fractal org.a11y.Bus[121390]: dbus-daemon[121390]: Activating service name=’org.a11y.atspi.Registry’ requested by ‘:1.0’ (uid=0 pid=121347 comm=”/usr/libexec/xdg-desktop-portal-gtk” label=”system_u:system_r:unconfined_t:s0″)
Aug 6 15:04:27 fractal org.a11y.Bus[121390]: dbus-daemon[121390]: Successfully activated service ‘org.a11y.atspi.Registry’
Aug 6 15:04:27 fractal org.a11y.Bus[121392]: SpiRegistry daemon is running with well-known name – org.a11y.atspi.Registry
Aug 6 15:04:27 fractal dbus-daemon[121221]: [session uid=0 pid=121219] Successfully activated service ‘org.freedesktop.impl.portal.desktop.gtk’
Aug 6 15:04:27 fractal dbus-daemon[121221]: [session uid=0 pid=121219] Successfully activated service ‘org.freedesktop.portal.Desktop’
Aug 6 15:05:09 fractal dbus-broker[949]: A security policy denied :1.497 to send method call /org/freedesktop/login1/seat/seat0:org.freedesktop.login1.Seat.Inhibit to org.freedesktop.login1.
🙁
P.U.
Hi pupu,
since I suspect the root cause may be the same, please retrieve the same information that was asked by Bilbotine in this post: https://forum.nomachine.com/topic/black-screen-connecting-to-rocky-linux-9#post-54100. Do that after going to back to the original situation that was giving you the crash.
Thank you in advance for your help.
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