Why can't I see the screen shared by more than three users?

I installed it on Ubuntu 20.04. I changed the default ports of nginx to 2443 and 8810. After changing the configuration, the video can come out, but it can be seen when two people share the screen, but it cannot be seen by more than three people. Why is this? Does anyone know what else needs to be changed?

Check the browser js console for errors. Are there any?

In addition (and I think the browser console will support this), it seems like your JVB is not working. I strongly suspect a firewall port issue. Check port 10000/UDP on your server, make sure it’s accessible and properly forwarded if behind a NAT.

Thanks! You should be right!

Thank you so much, I did exactly what you gave!