WebRTC connection failed due to DTLS error

[Vladimir Tyutin]

Please assist me to solve the issue below.
I observe WebRTC peer connection can't be established.
In log I see some errors related to dtls. Please help me understand the log
below and get the issue resolved:

0:01:21.644288173  1090  0x1b401b0 TRACE              webrtcbin
gst-plugins-bad-1.18.2/ext/webrtc/gstwebrtcbin.c:1073:_collate_peer_connection_states:<webrtc>
transceiver 0x1ab0f08 DTLS state: 0x0
0:01:21.644405214  1090  0x1b401b0 TRACE              webrtcbin
gst-plugins-bad-1.18.2/ext/webrtc/gstwebrtcbin.c:1086:_collate_peer_connection_states:<webrtc>
transceiver 0x1ab0f08 ICE state: 0x1
0:01:21.644569089  1090  0x1b401b0 TRACE              webrtcbin
gst-plugins-bad-1.18.2/ext/webrtc/gstwebrtcbin.c:1073:_collate_peer_connection_states:<webrtc>
transceiver 0x1bed050 DTLS state: 0x3
0:01:21.644678631  1090  0x1b401b0 TRACE              webrtcbin
gst-plugins-bad-1.18.2/ext/webrtc/gstwebrtcbin.c:1086:_collate_peer_connection_states:<webrtc>
transceiver 0x1bed050 ICE state: 0x2
0:01:21.644764381  1090  0x1b401b0 TRACE              webrtcbin
gst-plugins-bad-1.18.2/ext/webrtc/gstwebrtcbin.c:1131:_collate_peer_connection_states:<webrtc>
ICE connection state: 0x6. DTLS connection state: 0x9
0:01:21.644837673  1090  0x1b401b0 FIXME              webrtcbin
gst-plugins-bad-1.18.2/ext/webrtc/gstwebrtcbin.c:1189:_collate_peer_connection_states:<webrtc>
Undefined situation detected, returning old state
0:01:21.762102246  1090  0x1f1b7b0 WARN           dtlssrtpdemux
gst-plugins-bad-1.18.2/ext/dtls/gstdtlssrtpdemux.c:134:sink_chain:<dtlssrtpdemux2>
received invalid buffer: 1
0:01:21.769914036  1090  0x1f1b7b0 ERROR         dtlsconnection
gst-plugins-bad-1.18.2/ext/dtls/gstdtlsconnection.c:985:handle_error:<GstDtlsConnection at 0x1da56f0>
Fatal SSL error
0:01:21.770157620  1090  0x1f1b7b0 ERROR         dtlsconnection
gst-plugins-bad-1.18.2/ext/dtls/gstdtlsconnection.c:968:ssl_err_cb:<GstDtlsConnection at 0x1da56f0>
ssl error:
2947169560:error:14102410:lib(20):func(258):reason(1040):NA:0:SSL alert
number 40

0:01:21.770551453  1090  0x1f1b7b0 ERROR                dtlsdec
gst-plugins-bad-1.18.2/ext/dtls/gstdtlsdec.c:502:process_buffer:<dtlsdec2>
Error processing buffer: Fatal SSL error
0:01:21.770553453  1090  0x1b401b0 TRACE              webrtcbin
gst-plugins-bad-1.18.2/ext/webrtc/gstwebrtcbin.c:1073:_collate_peer_connection_states:<webrtc>
transceiver 0x1ab0f08 DTLS state: 0x0
0:01:21.770745245  1090  0x1b401b0 TRACE              webrtcbin
gst-plugins-bad-1.18.2/ext/webrtc/gstwebrtcbin.c:1086:_collate_peer_connection_states:<webrtc>
transceiver 0x1ab0f08 ICE state: 0x1
0:01:21.770861286  1090  0x1b401b0 TRACE              webrtcbin
gst-plugins-bad-1.18.2/ext/webrtc/gstwebrtcbin.c:1073:_collate_peer_connection_states:<webrtc>
transceiver 0x1bed050 DTLS state: 0x2
0:01:21.770951120  1090  0x1b401b0 TRACE              webrtcbin
gst-plugins-bad-1.18.2/ext/webrtc/gstwebrtcbin.c:1086:_collate_peer_connection_states:<webrtc>
transceiver 0x1bed050 ICE state: 0x2
0:01:21.771039203  1090  0x1b401b0 TRACE              webrtcbin
gst-plugins-bad-1.18.2/ext/webrtc/gstwebrtcbin.c:1131:_collate_peer_connection_states:<webrtc>
ICE connection state: 0x6. DTLS connection state: 0x5
0:01:21.771119036  1090  0x1b401b0 TRACE              webrtcbin
gst-plugins-bad-1.18.2/ext/webrtc/gstwebrtcbin.c:1145:_collate_peer_connection_states:<webrtc>
returning failed
0:01:21.771230036  1090  0x1b401b0 INFO               webrtcbin
gst-plugins-bad-1.18.2/ext/webrtc/gstwebrtcbin.c:1295:_update_peer_connection_state_task:<webrtc>
Peer connection state change from connecting(1) to failed(4)
[CAMERA_DEBUG] Peer connection state: failed
0:01:21.770664245  1090  0x1f1b7b0 WARN                 dtlsdec
gst-plugins-bad-1.18.2/ext/dtls/gstdtlsdec.c:503:process_buffer:<dtlsdec2>
error: Fatal SSL error
0:01:21.772238245  1090  0x1f1b7b0 ERROR                dtlsdec
gst-plugins-bad-1.18.2/ext/dtls/gstdtlsdec.c:618:sink_chain:<dtlsdec2>
Failed to process buffer: error
0:01:21.808121366  1090  0x1f1ba90 WARN                 basesrc
gstreamer-1.18.2/libs/gst/base/gstbasesrc.c:3127:gst_base_src_loop:<nicesrc2>
error: Internal data stream error.
0:01:21.808266866  1090  0x1f1ba90 WARN                 basesrc
gstreamer-1.18.2/libs/gst/base/gstbasesrc.c:3127:gst_base_src_loop:<nicesrc2>
error: streaming stopped, reason error (-5)
0:01:21.809681158  1090  0x1f1ba90 WARN                   queue
gstreamer-1.18.2/plugins/elements/gstqueue.c:990:gst_queue_handle_sink_event:<queue8>
error: Internal data stream error.
0:01:21.809811158  1090  0x1f1ba90 WARN                   queue
gstreamer-1.18.2/plugins/elements/gstqueue.c:990:gst_queue_handle_sink_event:<queue8>
error: streaming stopped, reason error (-5)
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/gstreamer-devel/attachments/20201219/88c00e0f/attachment.htm>