WebRTC doesn't work on firefox through NAT when webrtcAdditionalHosts contains DNS name

[Zouizoui78]

Which version are you using?

1.10

Which operating system are you using?

Linux amd64 Docker

Describe how to replicate the issue

I have the webrtcAdditionalHosts set with the local IP of my server and its DNS name like so :

webrtcAdditionalHosts: [xxx.xxx.xxx.xxx, dns.name]

Everything is working on the LAN.
It also works from the internet when NAT comes into play, but not in Firefox. I tried with Chrome and Edge and it works so it's not an issue with udp, port forwarding or something else.

After a few seconds, the following error shows up in the console in Firefox :

WebRTC: ICE failed, add a STUN server and see about:webrtc for more details

EDIT : when trying in Firefox with webrtcAdditionalHosts containing the public IP instead of the DNS name, it's working.

Server logs

Logs when trying to stream from Edge (ip addresses obfuscated) :

mediamtx  | 2024/12/04 21:34:46 INF MediaMTX v1.10.0
mediamtx  | 2024/12/04 21:34:46 INF configuration loaded from /mediamtx.yml
mediamtx  | 2024/12/04 21:34:46 INF [playback] listener opened on :9996
mediamtx  | 2024/12/04 21:34:46 INF [RTSP] listener opened on :8554 (TCP), :8000 (UDP/RTP), :8001 (UDP/RTCP)
mediamtx  | 2024/12/04 21:34:46 INF [WebRTC] listener opened on :8889 (HTTP), :8189 (ICE/UDP)
mediamtx  | 2024/12/04 21:34:56 INF [WebRTC] [session b6c13f34] created by 127.0.0.1:52170
mediamtx  | 2024/12/04 21:34:56 INF [path camera1] runOnDemand command started
mediamtx  | 2024/12/04 21:34:57 INF [RTSP] [conn 127.0.0.1:41490] opened
mediamtx  | 2024/12/04 21:34:57 INF [RTSP] [session 0429162c] created by 127.0.0.1:41490
mediamtx  | 2024/12/04 21:34:57 INF [path camera1] [recorder] recording 2 tracks (H264, Opus)
mediamtx  | 2024/12/04 21:34:57 INF [RTSP] [session 0429162c] is publishing to path 'camera1', 2 tracks (H264, Opus)
mediamtx  | 2024/12/04 21:34:58 INF [WebRTC] [session b6c13f34] peer connection established, local candidate: host/udp/dns.name/8189, remote candidate: prflx/udp/clientip/31167
mediamtx  | 2024/12/04 21:34:58 INF [WebRTC] [session b6c13f34] is reading from path 'camera1', 2 tracks (H264, Opus)

Logs when trying from Firefox :

mediamtx  | 2024/12/04 21:37:41 INF MediaMTX v1.10.0
mediamtx  | 2024/12/04 21:37:41 INF configuration loaded from /mediamtx.yml
mediamtx  | 2024/12/04 21:37:41 INF [playback] listener opened on :9996
mediamtx  | 2024/12/04 21:37:41 INF [RTSP] listener opened on :8554 (TCP), :8000 (UDP/RTP), :8001 (UDP/RTCP)
mediamtx  | 2024/12/04 21:37:41 INF [WebRTC] listener opened on :8889 (HTTP), :8189 (ICE/UDP)
mediamtx  | 2024/12/04 21:37:45 INF [WebRTC] [session b39b258b] created by 127.0.0.1:35866
mediamtx  | 2024/12/04 21:37:45 INF [path camera1] runOnDemand command started
mediamtx  | 2024/12/04 21:37:46 INF [RTSP] [conn 127.0.0.1:57804] opened
mediamtx  | 2024/12/04 21:37:46 INF [RTSP] [session e94c170d] created by 127.0.0.1:57804
mediamtx  | 2024/12/04 21:37:46 INF [path camera1] [recorder] recording 2 tracks (H264, Opus)
mediamtx  | 2024/12/04 21:37:46 INF [RTSP] [session e94c170d] is publishing to path 'camera1', 2 tracks (H264, Opus)
mediamtx  | 2024/12/04 21:37:56 INF [WebRTC] [session b39b258b] closed: deadline exceeded while waiting connection

Network dump

No response

[YehorFedorov]

Same issue...
Any updates on this?