Can't telnet localhost 11100
Good morning everybody,
I use Veyon 4.5.2 on an ubuntu 18.04.03 LTS school lab. I face this issue: panel only shows if PC is up or down (gray, yellow).
If I try to telnet both localhost or remote PCs port 11100 I get "connection refused".
I enabled debug log, but both teacher and student site nothing is logged at all.
If I netstat, I can't find veyon listening on any port: it seems died, even if systemctl claims it's alive.
I can see SYN packets leaving the teacher side, but it never gets answers.
The lab was working, then at a certain moment all PCs stopped working together.
Software updates are administratively disabled.
I use local users and keypair authentication; keys are fine.
Thanks for help!