I do have quite the same experience with a number of 25 computers in wifi.
You can probably increase the response by having the master on RJ45 network cable if possible.

Yes, /NoStartMenuFolder is indeed the correct option. Thank you for pointing out the missing entry in the documentation which just has been added.

maybe in the new release (4.5.4) this bug has been solved

Figured it go to registry Computer\HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
Add a DWORD 32 BIT VALUE name it DisableTaskMgr and the value is 1. Windows 10. Do the same here to Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System. It works on all verison of Window 10. Even Home.

@alexia74 Can you mention any information about it such as issues. Screenshots and show us the settings. Maybe we can resolve the issue we need further information.

@norbinyo I mean the configuration page "Locations & computers" in the Veyon Configurator program where you added all the computers 😉 It would be interesting to see if there's a problem with hostnames.

The VariantArrayMessage messages are interesting. They seem to indicate some kind of protocol incompatibility issue between master and client computers. Did you compile Veyon on your own on Linux Mint? If so, which version of Qt 5 is installed?

Regarding the screenshot warning: thanks for pointing that out! I just fixed the issue which will also be part of the upcoming 4.5.3 release.

@glew_ Monitoring/controlling student's computers at home is not possible. You would need to use VPN solutions to make the computers accessible in general and then also have the students install the Veyon Service – likely not feasible 😉 All I can suggest for the moment is to use meeting tools which allow students to share their screens.

Can you check whether you are in remote control mode, i.e. the "Send shortcut" button is visible? The remote control/view button logic may be somewhat confusing and needs to be improved.

Can you post a screenshot of the Master configuration page where you disabled some features? At a quick test I was unable to reproduce the behaviour you described.

Please note that you can't delete websites/programs that you configured statically in Veyon Configurator. Only custom websites/programs opened by teachers and added after checking the "Remember" checkbox can be removed afterwards using the delete key.

Currently you can only block Internet access completely using the Internet Access Control add-on. However it allows configuring exceptions (statically) such as local or intranet sites so these sites stay reachable while the Internet access is blocked. In a future release this year, we'll add a blacklisting features, so teachers can easily block the access to specific sites, e.g. video platforms.

@treizek maybe you need all gigabit interfaces and high end cpu, but for what vnc dont offer sound right ?

@marcel

You would probably have the default ACL applied which should by default permit all IPv4 inbound and outbound traffic.

Security groups are stateful so any outbound traffic sent from an instance is allowed a return response regardless of the inbound rules you have defined. Responses to allowed inbound traffic are also not blocked regardless of any outbound rules applied.

If you created and applied the security group then you will need to add the necessary inbound rules. By default this security group includes an outbound rule that permits all outgoing traffic.

The default security group allows all inbound traffic (and by default all outbound traffic) unless additional rules have been applied. If you are using the default security group I would suggest removing any added rules then attempting another demo connection to see if that works. I’m assuming the demo port is 11400.

@tobydox said in Veyon 4.5.1 I can't open website from Master:

Some technical background: first you should make sure the tray icon is visible on all computers. If it's not visible, the Veyon Service for some reason is not able to run it's own worker processes within the user session. The Veyon tray icon is provided by such a worker process. Launching the "Run program" or "Open website" features also launches a (different) worker process inside the user sessions as a helper process. This worker will then start the program or open the website and this way make sure the program or browser is opened with user privileges (instead of Admin/LocalSystem privileges which the Veyon Service is running with).

On computers where the tray icon is not visible, can you please check the VeyonServer.log file for messages starting with WindowsCoreFunctions and post them here?

Veyonserver.log
https://pastebin.com/Z4bGjPd0

VeyonService.log
https://pastebin.com/BH1And2t

Exactly, it looks like KDE NEON is not fully binary compatible with Ubuntu 20.04. I suggest to build the Veyon package on your own as described here: https://github.com/veyon/veyon/blob/master/README.md#veyon-on-linux