I'm actually very comfortable with veyon, so I wanted to know why the PC appears in red (authentication failed or access denied).

From what I see and can perceive, Veyon is used more in Windows than Linux (Ubuntu, Debian) in classrooms and not Linux in classrooms.

My issue is similar - the screen refresh is slow enough to watch it crawl down the screen. That's when connecting to a variety of different systems. Other means of connecting to them - Dameware, RDP, etc - act normally.

I am facing the exact same problem. Did you manage to find any solution?

example: there is a window asking for a password. The window is open and active on all stations.

@ARoger It doesn't work

Go to Veyon Configurator, Locations, and Computers, Go to your Computer list and look for a + icon in the right box, now add it like the other ones you did, and you should be fine.

Following up on this... I wasn't thinking yesterday. What I did was to just create a local user account with the same password as my network account. I actually made two of them because I wasn't sure which one I needed and didn't want to spend too much time in this. I did make these local accounts members of one of the groups that my domain account is a member of, also the same group as the normal local user logs into. Not sure if that's important, but I did it anyway. #1 username and #2 username.domain (not full domain, example .google not the .com part) And now I can see and control this computer, I'll configure the second computer when I have time.