WebRTC Screen Sharing: Minium requirements for firewall rule

[Pekka K]

We are behind firewall and Screen Share does not work to clients. What are the things to be enabled or opened our firewall to allow screen share to work. It suddenly stopped working, because our Palo Alto FW updated it self. When I run test.webrtc.org it says that:

UDP enabled -> failed

TCP enabled -> pass

ipv6 enabled -> warn

relay connectivity -> pass

reflexive connectivity -> failed (Timed out)

Host connectivity -> pass

And another test says: WebRTC p2p -> failed

My Screen Share based to  WebRTC Plugin-free Screen Sharing ® Muaz Khan 

https://www.webrtc-experiment.com/Pluginfree-Screen-Sharing/

It works about week ago, but stopped working suddenly.

Can anybody help and save my holidays season?!

Thanks in advance for all your help!

[Philipp Hancke]

Are you running a TURN server for your service? test.webrtc.org does and 

relay connectivity -> pass

but

reflexive connectivity -> failed (Timed out)

suggests things should work with a TURN server.

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[Pekka K]

Thank you Philipp! I included this image of this test report. 

If turn server will solve this connection problem, is there any turn server what can be tested for free. Can I test with these:

        iceServers.push({

            url: 'turn:turn.bistri.com:80',

            credential: 'homeo',

            username: 'homeo'

        });

        iceServers.push({

            url: 'turn:turn.anyfirewall.com:443?transport=tcp',

            credential: 'webrtc',

            username: 'webrtc'

        });

Or is there some else turn server for testing?