No good info on the bug, which seems plausible.  I do have an
observation though:

You can't rely on DTLS alerts arriving, since they are not
retransmitted.  You should use signaling for session termination.

On Mon, Sep 19, 2016 at 6:44 PM, Lorenzo Miniero <lmini...@gmail.com> wrote:
> Hi,
>
> I've noticed a weird behaviour that seems to have started happening with 
> Firefox 48, and is apparently happening with the latest Nightly as well. It 
> looks like Firefox is not sending a DTLS alert anymore when a PeerConnection 
> is closed. You can test this easily by opening this web page in a couple of 
> tabs:
>
> https://janus.conf.meetecho.com/videocalltest.html
>
> This is a demo of a WebRTC call with media going through my WebRTC server. To 
> replicate the issue, just choose two different usernames and have one call 
> the other, and then have one of the two hangup. This will result, for both 
> users, in a call to the PeerConnection.close(), and about:webrtc confirms 
> both PCs are indeed closed, but looking at the traffic via Wireshark/tcpdump 
> no DTLS alert is sent to the server by either of them. This makes the server 
> actually unaware of the PC being closed.
>
> Is this a known issue?
>
> Thanks!
> Lorenzo
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