No audio and video within conferenz

Hi there,

I have a strange problem with audio and video transmission during a conference.
When I start the conference, all participants can see and hear me, but I neither see nor hear anyone myself.
When I select my camera, however, I see myself in the small selection window. As soon as I switch back to conference mode, all participants are black and I cannot hear anyone.
What can be the reason?
A Surface with Windows 10 is used, all authorizations are granted and the virus protection / firewall is switched off. Everything runs smoothly on the iPad and Android tablet.

!
THX

Port 10000 udp not forwarded to the bridge.

Thx for the response.
How and where do I have to do it?

JVB is behind public address, the device handling that address - a router, a nat gateway, a vm cloud … More information you can find in the quick install guide in the advanced section.

i´m using a fritzbox an I added the port forwarding:


But nothing changes. it doesn´t work.
Also when I open every Port (it´s called Exposed Host) nothing changes.
What am I doing wrong?

I installed and tried firefox instead chrome - everyrhing works fine…