Novnc WebSocket on-error event

SYSTEM INFORMATION
OS type and version CentOS Linux 7.9.2009
Webmin version 2.000
Cloudmin version 9.6 Pro
Theme version 20.00
Package updates 7 package updates are available

I have firefox on parrot os and will connect to a vnc console with the novnc client, connection is from a local net without firewall

I’d advise that you use an external client to connect, such as TightVNC

i can connect via an vnc client yes, so thats no problem, but why is the novnc solution not working ?

I’ve not had much success with the NoVNC client - looking at your error, maybe check your firewall isn’t blocking connections.