Does the chromebooks have Linux (beta)? Or blocked by admins?

@itguy Thank you. will follow steps given and update

@drewloker said in 4.4.2 - Downgrade options? CRASHES Master and Clients, No Demo: Demo still doesn't work. I brought the whole lab up to 4.5.4.0 It went to Demo, showed my screen for a few second on a couple of the 7 students logged in a lab of 26 clients. Then, Demo stopped working even on the couple that did get my screen. I was able to back out of Demo mode with out crashing their computer. Hello i have the same problem .. i opened a new topic: https://veyon.nodebb.com/topic/1258/veyon-4-5-4-vnc-serveur-crash-on-demo-mode where I put the logs to see if tobydox manages to understand what is wrong ... Fred

Yes it is laggy. I love to let my students play. They usually complain about lag. I have decided to test this. I told on of the students to keep there game open and leave. I opened the app it was laggy and the lag stopped when I closed it.

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.