WebRTC on local network

I have a local network that doesn’t need to connect to the Internet. I have Wowza installed on a local server and I want to access a RTSP stream through WebRTC from within the network. I have everything set up ok (the plugin, the app etc) just that I get ICE failed, add a TURN server and see about:webrtc for more details in Firefox. In my vhosts I jave my local IP and udp setup.