Hello Tobydox
I now know the problem of error 87 ... but I don't know how to solve it yet ...
the error occurs if I am connected in RDP on the machine on which I am installing Veyon. if I am physically connected to the machine no more error 87 problem. From the information I could read, this is related to graphics driver problem ...
But you have necessarily done something about the graphics settings since until version 4.5.4.3 this does not pose a problem in RDP.
Fred

@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

@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

@jrpfahl

Try turning off the Windows Defender Firewall (Domain Network) for one of the Windows 10 computers and try again.

I'm sorry, no good news:

I don't know if this helps ... but when I start "veyon-server" as a login-Script I get this message:

0 I want to install Veyon on the RPi4. I have read about Debian packages and the instructions. I had a look in my /etc/apt/sources.list and it had an entry for buster, so I added the line for Veyon Buster: deb http://ppa.launchpad.net/veyon/stable/ubuntu bionic main I then tried to run the command sudo add-apt-repository ppa:veyon/stable. .

I am having this same issue. I used Veyon 4.4.1 and now I get the C++ Runtime error. The master PC is Windows 7.

@tobydox I just updated to version 4.1.4. indeed the problem was solved. Thank you!!

@tobydox
No problem, you can't be on dev and forum at the same time
Your job is really helpful for a lot of people, thanks for that.

I'd like to be more useful here on the forum, but not "good" enough yet with veyon to help much people.

Regards
ET

@MackenzieP

A tech at a neighboring school advised that rather than entering IP addresses into the Configurator’s Host address/IP field (Locations & computers) to instead enter computer names.

A bit confusing to me but he said to make the Host address/IP field match the Name field when using DHCP assigned addresses.

@tobydox I don't see where to add the parameter. I switched to advanced mode, under "service" I don't see any place to add a parameter under the VNC server section.

@tobydox what does the parameter "-noshm" mean out of curiosity.

@Sanny Thank you very much, this is the solution I was looking for!

Thank you for your investigations! I opened an issue at https://github.com/veyon/veyon/issues/420 so we can do further investigations and finally fix the issue.

Hi Tobias,

I just described a similar issue here: [https://github.com/veyon/veyon/issues/455](link url)

Thanks in advance,
Julius

Thank you very much for your feedback!

@tobydox

Hello tobydox

I have created an environment variable in the operating system with a value equal to 2

SET VEYON_SESSION_ID = 2

And also in the veyon-client environment.

veyon-cli config set Service/VEYON_SESSION_ID 2

My session ID is two

QUERY SESSION

SESSION NAME USER NAME ID STATE
services 0 Desc
rdp-tcp # 2 administrator 2 Active
console 3 Conn
rdp-tcp 65536 Listen

And in no case have I managed to make the screen that shows to the students the session in which the teacher works.

I have also test with the new version of Veyon 4.4.0

I would like to remind you that both the students and the teacher are working on their own virtual desktop connected by RDP, that is, they are all in session 2 of their own virtual desktop.

@DrewLoker this is already possible - simply enable the "Show confirmation dialog for potentially unsafe actions" option in the master configuration page in Veyon Configurator - see https://docs.veyon.io/en/latest/admin/reference.html#behaviour for details.

I just switched in General from "use system language" to English US... My local language GUI was really annoying in both Configurator and Master, and in older versions there was no English option for some reason.

In 4.1.0 I just noticed there is English. The moment I switched to English and reopened Configurator, clicking "Start service" worked right away

The line
[WARN] WindowsServiceControl: 'VeyonService' could not be started.
is not showing anymore in .log

So far no errors, everything looks fine. Going to install it on few class PCs and see if Master works without issues.