Hi all,
In random cases, when Firefox webrtc client connects to the media server, I'm
getting a DTLS handshake for the video channel (only) fails with DTLS v1.2
alert "illegal parameter". What is strange, that this alert is the first DTLS
message in the whole DTLS handshake session; and never appears in audio channel
(we use separate audio and video connections).
RFC tells :
illegal_parameter
A field in the handshake was out of range or inconsistent with
other fields. This message is always fatal.
But the alert message is the first one ! Could it be a reaction not to a
incoming DTLS, but to a wrong DTLS-related configurations in Firefox SDP ?
The server uses DTLS v1.0.
Wireshark log:
filter: ip.addr == 192.168.125.138 && dtls
5202 16:10:02.859969 192.168.125.39 50423 192.168.125.138 57
DTLSv1.2 Alert (Level: Fatal, Description: Illegal Parameter) 9001
5223 16:10:03.060687 192.168.125.138 9001 192.168.125.39 263
DTLSv1.0 Client Hello 50423
5255 16:10:03.353462 192.168.125.138 8001 192.168.125.39 263
DTLSv1.0 Client Hello 52713
5259 16:10:03.357654 192.168.125.39 52713 192.168.125.138 681
DTLSv1.0 Server Hello, Certificate, Server Key Exchange, Certificate
Request, Server Hello Done 8001
5262 16:10:03.383612 192.168.125.138 8001 192.168.125.39 298
DTLSv1.0 Certificate (Fragment) 52713
5263 16:10:03.391366 192.168.125.138 8001 192.168.125.39 298
DTLSv1.0 Certificate (Reassembled), Client Key Exchange (Fragment)
52713
5265 16:10:03.497471 192.168.125.138 8001 192.168.125.39 278
DTLSv1.0 Client Key Exchange (Reassembled), Certificate Verify 52713
5266 16:10:03.497691 192.168.125.138 8001 192.168.125.39 133
DTLSv1.0 Change Cipher Spec, Encrypted Handshake Message 52713
5273 16:10:03.502496 192.168.125.39 52713 192.168.125.138 133
DTLSv1.0 Change Cipher Spec, Encrypted Handshake Message 8001
5485 16:10:05.002177 192.168.125.138 9001 192.168.125.39 263
DTLSv1.0 Client Hello 50423
6012 16:10:09.001930 192.168.125.138 9001 192.168.125.39 263
DTLSv1.0 Client Hello 50423
6928 16:10:16.992382 192.168.125.138 9001 192.168.125.39 263
DTLSv1.0 Client Hello 50423
8791 16:10:32.971012 192.168.125.138 9001 192.168.125.39 263
DTLSv1.0 Client Hello 50423
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