SEB 3.x connection timeout while 2.3.2 connects without problems

[asterbini]

Describe the bug
I am using SEB for online exams.
With version 2.3.2 I connect without problems to our noVNC based programming lab server.
With version 3.x instead SEB does not connect and I get connection timeout.

To Reproduce

• Try the attached config file with version 3.3.3
• SEB gets a connection timeout error
• If instead you use version 2.3.2 all goes well

Expected behavior

• You should get a noVNC web-based terminal with a red top error bar (the server password has been redacted, this is expected)

Version Information
Please complete the following information:

• OS: macOS 14.5, M2 CPU
• SEB Version 3.3.3

Additional Context
I have tried many different configurations and SEB versions without success.
The attached configuration works in 2.3.2 but not on 3.3.3

exam-unencrypted.seb.zip

[danschlet]

I can see in your configuration file that you're using URL filters and embedded certificates with certificate pinning. These are features which complicate searching for such errors. I would need SEB log files and possibly access to a test environment (a demo/testing exam on your system) to analyze this issue. Also we don't have experience about what you called a "noVNC based programming lab server". Probably you would need to circle in closer where the issue might be located (disable certificate pinning, URL filtering etc. one-by-one to rule out that those features cause the issue).

There have been many changes from SEB 2.3.2 to 3.3.3, so it's impossible to point out what could cause the issue unless having much more detailed information.