Veyon Community Forum

Today I tried to run (as root):

veyon-server start

The error message looks like this:

veyon-server start QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root' 22/01/2025 12:12:34 passing arg to libvncserver: -rfbport 22/01/2025 12:12:34 passing arg to libvncserver: 11200 22/01/2025 12:12:34 passing arg to libvncserver: -rfbportv6 22/01/2025 12:12:34 passing arg to libvncserver: 11200 22/01/2025 12:12:34 passing arg to libvncserver: -passwd 22/01/2025 12:12:34 x11vnc version: 4.9.0 lastmod: 2019-01-05 pid: 10067 22/01/2025 12:12:34 Using X display :0 22/01/2025 12:12:34 rootwin: 0x496 reswin: 0xe00001 dpy: 0x8c0089b0 22/01/2025 12:12:34 22/01/2025 12:12:34 ------------------ USEFUL INFORMATION ------------------ 22/01/2025 12:12:34 X DAMAGE available on display, using it for polling hints. 22/01/2025 12:12:34 To disable this behavior use: '-noxdamage' 22/01/2025 12:12:34 22/01/2025 12:12:34 Most compositing window managers like 'compiz' or 'beryl' 22/01/2025 12:12:34 cause X DAMAGE to fail, and so you may not see any screen 22/01/2025 12:12:34 updates via VNC. Either disable 'compiz' (recommended) or 22/01/2025 12:12:34 supply the x11vnc '-noxdamage' command line option. 22/01/2025 12:12:34 X COMPOSITE available on display, using it for window polling. 22/01/2025 12:12:34 To disable this behavior use: '-noxcomposite' 22/01/2025 12:12:34 22/01/2025 12:12:34 Wireframing: -wireframe mode is in effect for window moves. 22/01/2025 12:12:34 If this yields undesired behavior (poor response, painting 22/01/2025 12:12:34 errors, etc) it may be disabled: 22/01/2025 12:12:34 - use '-nowf' to disable wireframing completely. 22/01/2025 12:12:34 - use '-nowcr' to disable the Copy Rectangle after the 22/01/2025 12:12:34 moved window is released in the new position. 22/01/2025 12:12:34 Also see the -help entry for tuning parameters. 22/01/2025 12:12:34 You can press 3 Alt_L's (Left "Alt" key) in a row to 22/01/2025 12:12:34 repaint the screen, also see the -fixscreen option for 22/01/2025 12:12:34 periodic repaints. 22/01/2025 12:12:34 22/01/2025 12:12:34 XFIXES available on display, resetting cursor mode 22/01/2025 12:12:34 to: '-cursor most'. 22/01/2025 12:12:34 to disable this behavior use: '-cursor arrow' 22/01/2025 12:12:34 or '-noxfixes'. 22/01/2025 12:12:34 using XFIXES for cursor drawing. 22/01/2025 12:12:34 GrabServer control via XTEST. 22/01/2025 12:12:34 22/01/2025 12:12:34 Scroll Detection: -scrollcopyrect mode is in effect to 22/01/2025 12:12:34 use RECORD extension to try to detect scrolling windows 22/01/2025 12:12:34 (induced by either user keystroke or mouse input). 22/01/2025 12:12:34 If this yields undesired behavior (poor response, painting 22/01/2025 12:12:34 errors, etc) it may be disabled via: '-noscr' 22/01/2025 12:12:34 Also see the -help entry for tuning parameters. 22/01/2025 12:12:34 You can press 3 Alt_L's (Left "Alt" key) in a row to 22/01/2025 12:12:34 repaint the screen, also see the -fixscreen option for 22/01/2025 12:12:34 periodic repaints. 22/01/2025 12:12:34 22/01/2025 12:12:34 XKEYBOARD: 22/01/2025 12:12:34 Switching to -xkb mode to recover these keysyms: 22/01/2025 12:12:34 xkb noxkb Keysym ("X" means present) 22/01/2025 12:12:34 --- ----- ----------------------------- 22/01/2025 12:12:34 X 0x40 at 22/01/2025 12:12:34 X 0x5b bracketleft 22/01/2025 12:12:34 X 0x5d bracketright 22/01/2025 12:12:34 X 0x7b braceleft 22/01/2025 12:12:34 X 0x7d braceright 22/01/2025 12:12:34 X 0x7c bar 22/01/2025 12:12:34 X 0x5c backslash 22/01/2025 12:12:34 22/01/2025 12:12:34 If this makes the key mapping worse you can 22/01/2025 12:12:34 disable it with the "-noxkb" option. 22/01/2025 12:12:34 22/01/2025 12:12:34 22/01/2025 12:12:34 X FBPM extension not supported. Xlib: extension "DPMS" missing on display ":0". 22/01/2025 12:12:34 X display is not capable of DPMS. 22/01/2025 12:12:34 -------------------------------------------------------- 22/01/2025 12:12:34 22/01/2025 12:12:34 Default visual ID: 0x3b 22/01/2025 12:12:34 Read initial data from X display into framebuffer. 22/01/2025 12:12:34 initialize_xdisplay_fb: \*\*\* fb creation failed: 0x0 try: 1 22/01/2025 12:12:35 Default visual ID: 0x3b 22/01/2025 12:12:35 Read initial data from X display into framebuffer. 22/01/2025 12:12:35 initialize_xdisplay_fb: \*\*\* fb creation failed: 0x0 try: 2 22/01/2025 12:12:35 Default visual ID: 0x3b 22/01/2025 12:12:35 Read initial data from X display into framebuffer. 22/01/2025 12:12:35 initialize_xdisplay_fb: \*\*\* fb creation failed: 0x0 try: 3 22/01/2025 12:12:35 Default visual ID: 0x3b 22/01/2025 12:12:35 Read initial data from X display into framebuffer. 22/01/2025 12:12:35 initialize_xdisplay_fb: \*\*\* fb creation failed: 0x0 try: 4 22/01/2025 12:12:35 Default visual ID: 0x3b 22/01/2025 12:12:35 Read initial data from X display into framebuffer. 22/01/2025 12:12:35 initialize_xdisplay_fb: \*\*\* fb creation failed: 0x0 try: 5 2025-01-22T12:12:35.793: \[ERR\] LinuxPlatformPlugin: Received signal 11 2025-01-22T12:12:35.795: \[ERR\] BACKTRACE: /lib/x86_64-linux-gnu/libc.so.6(+0x42520) \[0x7a7df4442520\] /usr/lib/x86_64-linux-gnu/veyon/builtin-x11vnc-server.so(+0x7fc00) \[0x7a7ddc67fc00\] /usr/lib/x86_64-linux-gnu/veyon/builtin-x11vnc-server.so(+0x40450) \[0x7a7ddc640450\] /usr/lib/x86_64-linux-gnu/veyon/builtin-x11vnc-server.so(+0x145e5) \[0x7a7ddc6145e5\] veyon-server(+0xa8f1) \[0x5802944ff8f1\] /lib/x86_64-linux-gnu/libQt5Core.so.5(+0xccca1) \[0x7a7df4cccca1\] /lib/x86_64-linux-gnu/libc.so.6(+0x94ac3) \[0x7a7df4494ac3\] /lib/x86_64-linux-gnu/libc.so.6(+0x126850) \[0x7a7df4526850\] 2025-01-22T12:12:35.795: \[CRIT\] Aborting due to severe error Abgebrochen

Hello,

on Linux the Screen Recorder add-on is provided in separate packages to avoid unneccessary FFMPEG dependencies when using one of the other add-ons only. You therefore need to install the appropriate package from https://github.com/veyon/addons/releases (Click on "Show all 26 assets" to see all files).

Best regards
Tobias

Same issues when install veyon master on Windows 10.
I don't know what's wrong, I already check the port already active.
Try install veyon master on linux and authenticate it using Postman and it works.
This is my solution until now

@SipiFree I have windows 11 and it works perfectly fine, you could try to check if the service is running and the port is free. Use netstat to check if the port is used. If it's not try to reinstall Veyon and make sure IP is right. The MAC doesn't have to be right because it is for wake on lan.

Salve,
Fai una lista di IP LAN di tutti i PC (oppure nome host - consigliato) e il tuo problema potrebbe essere che gli IP stanno cambiando per colpa del DHCP del router, se hai acceso al router aggiungi delle regole per tutti i PC.
Ad esempio Lab1-pc1 ip X.X.X.1 pc2 X.X.X.2, oppure per evitare tutto questo metti dei nomi a ogni pc (nelle impostazioni di Windows -> sistema -> informazioni -> rinominare il PC).

veyon-configurator
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
Logger: "/tmp/VeyonConfigurator.log" is a symlink and will not be written to for security reasons
2024-12-06T10:23:11.405: [ERR] CryptoCore: failed to decrypt password!
2024-12-06T10:23:11.416: [ERR] LinuxPlatformPlugin: Received signal 11
2024-12-06T10:23:11.417: [ERR] BACKTRACE:
/lib/x86_64-linux-gnu/libc.so.6(+0x3d1a0) [0x7ffb2de591a0]
/usr/bin/veyon-configurator(+0x1d945) [0x56319b741945]
/usr/bin/veyon-configurator(+0x22d70) [0x56319b746d70]
/usr/bin/veyon-configurator(+0x129a1) [0x56319b7369a1]
/lib/x86_64-linux-gnu/libc.so.6(+0x27b8a) [0x7ffb2de43b8a]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x85) [0x7ffb2de43c45]
/usr/bin/veyon-configurator(+0x134b1) [0x56319b7374b1]
2024-12-06T10:23:11.417: [CRIT] Aborting due to severe error

Reviving this thread as this is the only one i can find on the matter, but i've been having this same issue, too.

At first, staff would log in to veyon Master with their own account, but i realised that students being monitored by Veyon were able to bypass the Student Web Filter on our Fortigate Firewall because the firewall saw the teachers logon session on the DC and it looks like the teacher has now logged on and is assigned the profile.

To bypass this, i have had to create a generic account for use with Veyon which is set as a student, so this retains the student webfilter, however i can see all the different entries from different devices on the firewall from this user.

@tobydox said in Students bypassing filtering:

the Veyon Server/Service on the client computers check the teacher's credentials by performing a temporary internal user logon with the teacher's username and password. However it does not initiate a real user sessions so I wonder why your firewall recognizes the teacher as being logged on

Are you able to expand on this ^^^? Because the veyon user logon event shows up in the DC's event logs (which are monitored by the firewall to assign user sessions) and there seems to be no difference in this logon to any other domain user logon. The workstations are only checked for logoff events, as these don't appear on the DC.

As far as the firewall is concerned, whenever a client computer is connected to, the logged on user has changed, as this is now the latest logon event seen on the DC for that device.