A security bug around this behavior (which is not disclosed to the public yet) 
has been fixed and uplifted to 48, which probably causes this new behavior.

  Nils

> On Sep 19, 2016, at 02:22, Lorenzo Miniero <lmini...@gmail.com> wrote:
> 
> Il giorno lunedì 19 settembre 2016 11:18:52 UTC+2, Martin Thomson ha scritto:
>> 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.
>> 
> 
> 
> Hi Martin,
> 
> yep, you're right, and in some modules we're already doing this, although 
> it's not happening in this case which is what made the bug pop up.
> 
> Thanks,
> Lorenzo
> 
> 
>> 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
>>> _______________________________________________
>>> dev-media mailing list
>>> dev-media@lists.mozilla.org
>>> https://lists.mozilla.org/listinfo/dev-media
> 
> _______________________________________________
> dev-media mailing list
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