Created question in FIWARE Q/A platform on 12-12-2015 at 22:12
Please, ANSWER this question AT https://stackoverflow.com/questions/34245081/kurento-hello-world-stuck-after-receiving-candidates

Question:
Kurento Hello World Stuck after receiving candidates

Description:
I am trying to setup a Kurento media server behind an nginx proxy & testing with the Kurento-hello-world example. The TURN server is in place & Kurento is up.

I added the TURN url in file /etc/kurento/modules/kurento/WebRtcEndpoint.conf.ini as explained here

turnURL=kurento:kurento@193.147.XXX.XXX:3478

I opened the specified ports :

3478 TCP & UDP
49152-65535 UDP

EDIT : I notice TURN is announcing a remote HEAD IP that seems to be in my network, but is not linked to my project and never specified in configs, as seen in the browser console, I receive a candidate 2 with the unknown external IP and a candidate 3 with good external IP but wonder if the browser can be stocked trying to connect to a bad one. Is it possible to avoid TURN propose a specific address ?

Locally, I can see (netstat -tulpn) the candidates UDP ports allocted on both kurento & TURN machines. The video input that should come from the server never appears, meaning the Connection is never achieved ?

TURN Server :

handle_udp_packet: New UDP endpoint: local addr 192.168.LO.CAL:3478, remote addr 130.206.UNK.KNO:54384
realm <x> user <>: incoming packet OLD BINDING processed, success
realm <x> user <kurento>: incoming packet OLD BINDING processed, success
realm <x> user <kurento>: incoming packet OLD BINDING processed, success
realm <x> user <>: incoming packet OLD BINDING processed, success
realm <x> user <>: incoming packet OLD BINDING processed, success
realm <x> user <kurento>: incoming packet OLD BINDING processed, success
closed (2nd stage), user <> realm <x> origin <>, local 192.168.LO.CAL:3478, remote *130.206.UNK.KNO*:54384, reason: allocation watchdog determined stale session state

Brower Hello-World Console :

WebRTC loopback starting
Use freeice
...
Created SDP offer
Local description set
...
onOffer
Got MediaPipeline
...
Local candidate:
{}
Got WebRtcEndpoint
Got FaceOverlayFilter
Connecting...
SDP answer obtained. Processing...
SDP answer received, setting remote description
SDP answer received, setting remote description
Remote candidate:
{
_module_: 'kurento'
,
_type_: 'IceCandidate'
,
candidate: 'candidate:1 1 UDP 2013266431 192.168.LO.CAL 53311 typ host'
,
sdpMLineIndex: 0
,
sdpMid: 'audio'
}
ICE candidate received
Remote candidate:
{
_module_: 'kurento'
,
_type_: 'IceCandidate'
,
candidate: 'candidate:1 1 UDP 2013266431 192.168.LO.CAL 53311 typ host'
,
sdpMLineIndex: 1
,
sdpMid: 'video'
}
ICE candidate received
Remote URL:
'blob:http%3A//localhost%3A8080/7b1cfb2c-d8bd-4e74-9a98-990ff35ac3fe'
Remote candidate:
{
_module_: 'kurento'
,
_type_: 'IceCandidate'
,
candidate: 'candidate:1 2 UDP 2013266430 192.168.LO.CAL 54384 typ host'
,
sdpMLineIndex: 0
,
sdpMid: 'audio'
}
ICE candidate received
Remote candidate:
{
_module_: 'kurento'
,
_type_: 'IceCandidate'
,
candidate: 'candidate:1 2 UDP 2013266430 192.168.LO.CAL 54384 typ host'
,
sdpMLineIndex: 1
,
sdpMid: 'video'
}
ICE candidate received
Loopback established
Remote candidate:
{
_module_: 'kurento'
,
_type_: 'IceCandidate'
,
candidate: 'candidate:2 1 UDP 1677721855 130.206.UNK.KNO 53311 typ srflx raddr 192.168.LO.CAL rport 53311'
,
sdpMLineIndex: 0
,
sdpMid: 'audio'
}
ICE candidate received
Remote candidate:
{
_module_: 'kurento'
,
_type_: 'IceCandidate'
,
candidate: 'candidate:2 1 UDP 1677721855 130.206.UNK.KNO 53311 typ srflx raddr 192.168.LO.CAL rport 53311'
,
sdpMLineIndex: 1
,
sdpMid: 'video'
}
ICE candidate received
Remote candidate:
{
_module_: 'kurento'
,
_type_: 'IceCandidate'
,
candidate: 'candidate:3 1 UDP 1006633215 130.206.REM.OTE 63499 typ relay raddr 192.168.LO.CAL rport 53311'
,
sdpMLineIndex: 0
,
sdpMid: 'audio'
}
ICE candidate received
Remote candidate:
{
_module_: 'kurento'
,
_type_: 'IceCandidate'
,
candidate: 'candidate:3 1 UDP 1006633215 130.206.REM.OTE 63499 typ relay raddr 192.168.LOC.AL rport 53311'
,
sdpMLineIndex: 1
,
sdpMid: 'video'
}
ICE candidate received

And the kurento log (sorry) :

pointImpl.cpp:281 WebRtcEndpointImpl() stun port 3478
pointImpl.cpp:285 WebRtcEndpointImpl() stun address 130.206.REM.OTE
pointImpl.cpp:294 WebRtcEndpointImpl() turn info:
...
Transport.cpp:482 processMessage() Message: >{"id":19,"jsonrpc":"2.0","method":"invoke","params":{"object":"235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/4d01d709-1471-4fa6-b889-b3a79cb4e02c_kurento.WebRtcEndpoint","operation":"gatherCandidates","sessionId":"f3b4f17e-d7e1-44d6-aec5-e0106ce37c50"}}
EventHandler.cpp:52 sendEvent() Sending event: {"jsonrpc":"2.0","method":"onEvent","params":{"value":{"data":{"candidate":

{"__module__":"kurento","__type__":"IceCandidate","candidate":"candidate:1 1 UDP 2013266431 192.168.LO.CAL 58764 typ host","sdpMLineIndex":0,"sdpMid":"audio"}

,"source":"235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/4d01d709-1471-4fa6-b889-b3a79cb4e02c_kurento.WebRtcEndpoint","tags":[],"timestamp":"1449959528","type":"OnIceCandidate"},"object":"235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/4d01d709-1471-4fa6-b889-b3a79cb4e02c_kurento.WebRtcEndpoint","type":"OnIceCandidate"}}}
-> f3b4f17e-d7e1-44d6-aec5-e0106ce37c50
KurentoEventHandler EventHandler.cpp:52 sendEvent() Sending event: {"jsonrpc":"2.0","method":"onEvent","params":{"value":{"data":{"candidate":

{"__module__":"kurento","__type__":"IceCandidate","candidate":"candidate:1 1 UDP 2013266431 192.168.LO.CAL 58764 typ host","sdpMLineIndex":1,"sdpMid":"video"}

,"source":"235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/4d01d709-1471-4fa6-b889-b3a79cb4e02c_kurento.WebRtcEndpoint","tags":[],"timestamp":"1449959528","type":"OnIceCandidate"},"object":"235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/4d01d709-1471-4fa6-b889-b3a79cb4e02c_kurento.WebRtcEndpoint","type":"OnIceCandidate"}}}
-> f3b4f17e-d7e1-44d6-aec5-e0106ce37c50
KurentoEventHandler EventHandler.cpp:52 sendEvent() Sending event: {"jsonrpc":"2.0","method":"onEvent","params":{"value":{"data":{"candidate":

{"__module__":"kurento","__type__":"IceCandidate","candidate":"candidate:1 2 UDP 2013266430 192.168.LO.CAL 36158 typ host","sdpMLineIndex":0,"sdpMid":"audio"}

,"source":"235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/4d01d709-1471-4fa6-b889-b3a79cb4e02c_kurento.WebRtcEndpoint","tags":[],"timestamp":"1449959528","type":"OnIceCandidate"},"object":"235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/4d01d709-1471-4fa6-b889-b3a79cb4e02c_kurento.WebRtcEndpoint","type":"OnIceCandidate"}}}
-> f3b4f17e-d7e1-44d6-aec5-e0106ce37c50
KurentoEventHandler EventHandler.cpp:52 sendEvent() Sending event: {"jsonrpc":"2.0","method":"onEvent","params":{"value":{"data":{"candidate":

{"__module__":"kurento","__type__":"IceCandidate","candidate":"candidate:1 2 UDP 2013266430 192.168.LO.CAL 36158 typ host","sdpMLineIndex":1,"sdpMid":"video"}

,"source":"235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/4d01d709-1471-4fa6-b889-b3a79cb4e02c_kurento.WebRtcEndpoint","tags":[],"timestamp":"1449959528","type":"OnIceCandidate"},"object":"235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/4d01d709-1471-4fa6-b889-b3a79cb4e02c_kurento.WebRtcEndpoint","type":"OnIceCandidate"}}}
-> f3b4f17e-d7e1-44d6-aec5-e0106ce37c50
Transport.cpp:484 processMessage() Response: >{"id":19,"jsonrpc":"2.0","result":{"sessionId":"f3b4f17e-d7e1-44d6-aec5-e0106ce37c50","value":null}}
Transport.cpp:482 processMessage() Message: >{"id":20,"jsonrpc":"2.0","method":"invoke","params":{"object":"235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/d4e4e54b-1610-4b0c-93e7-5f46558c7a40_kurento.FaceOverlayFilter","operation":"setOverlayedImage","operationParams":

{"heightPercent":1.6000000000000001,"offsetXPercent":-0.34999999999999998,"offsetYPercent":-1.2,"uri":"https://localhost:8080/img/mario-wings.png","widthPercent":1.6000000000000001}

,"sessionId":"f3b4f17e-d7e1-44d6-aec5-e0106ce37c50"}}
Transport.cpp:484 processMessage() Response: >{"id":20,"jsonrpc":"2.0","result":{"sessionId":"f3b4f17e-d7e1-44d6-aec5-e0106ce37c50","value":null}}
Transport.cpp:482 processMessage() Message: >{"id":21,"jsonrpc":"2.0","method":"invoke","params":{"object":"235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/4d01d709-1471-4fa6-b889-b3a79cb4e02c_kurento.WebRtcEndpoint","operation":"connect","operationParams":

{"sink":"235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/d4e4e54b-1610-4b0c-93e7-5f46558c7a40_kurento.FaceOverlayFilter"}

,"sessionId":"f3b4f17e-d7e1-44d6-aec5-e0106ce37c50"}}
ementImpl.cpp:655 connect() Connecting 235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/4d01d709-1471-4fa6-b889-b3a79cb4e02c_kurento.WebRtcEndpoint -> 235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/d4e4e54b-1610-4b0c-93e7-5f46558c7a40_kurento.FaceOverlayFilter params AUDIO
ementImpl.cpp:655 connect() Connecting 235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/4d01d709-1471-4fa6-b889-b3a79cb4e02c_kurento.WebRtcEndpoint -> 235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/d4e4e54b-1610-4b0c-93e7-5f46558c7a40_kurento.FaceOverlayFilter params VIDEO
ementImpl.cpp:655 connect() Connecting 235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/4d01d709-1471-4fa6-b889-b3a79cb4e02c_kurento.WebRtcEndpoint -> 235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/d4e4e54b-1610-4b0c-93e7-5f46558c7a40_kurento.FaceOverlayFilter params DATA
Transport.cpp:484 processMessage() Response: >{"id":21,"jsonrpc":"2.0","result":{"sessionId":"f3b4f17e-d7e1-44d6-aec5-e0106ce37c50","value":null}}
Transport.cpp:482 processMessage() Message: >{"id":22,"jsonrpc":"2.0","method":"invoke","params":{"object":"235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/d4e4e54b-1610-4b0c-93e7-5f46558c7a40_kurento.FaceOverlayFilter","operation":"connect","operationParams":

{"sink":"235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/4d01d709-1471-4fa6-b889-b3a79cb4e02c_kurento.WebRtcEndpoint"}

,"sessionId":"f3b4f17e-d7e1-44d6-aec5-e0106ce37c50"}}
ementImpl.cpp:655 connect() Connecting 235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/d4e4e54b-1610-4b0c-93e7-5f46558c7a40_kurento.FaceOverlayFilter -> 235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/4d01d709-1471-4fa6-b889-b3a79cb4e02c_kurento.WebRtcEndpoint params AUDIO
ementImpl.cpp:655 connect() Connecting 235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/d4e4e54b-1610-4b0c-93e7-5f46558c7a40_kurento.FaceOverlayFilter -> 235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/4d01d709-1471-4fa6-b889-b3a79cb4e02c_kurento.WebRtcEndpoint params VIDEO
ementImpl.cpp:655 connect() Connecting 235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/d4e4e54b-1610-4b0c-93e7-5f46558c7a40_kurento.FaceOverlayFilter -> 235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/4d01d709-1471-4fa6-b889-b3a79cb4e02c_kurento.WebRtcEndpoint params DATA
EventHandler.cpp:52 sendEvent() Sending event: {"jsonrpc":"2.0","method":"onEvent","params":{"value":{"data":{"candidate":

{"__module__":"kurento","__type__":"IceCandidate","candidate":"candidate:2 1 UDP 1677721855 130.206.UNK.KNO 58764 typ srflx raddr 192.168.LO.CAL rport 58764","sdpMLineIndex":0,"sdpMid":"audio"}

,"source":"235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/4d01d709-1471-4fa6-b889-b3a79cb4e02c_kurento.WebRtcEndpoint","tags":[],"timestamp":"1449959528","type":"OnIceCandidate"},"object":"235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/4d01d709-1471-4fa6-b889-b3a79cb4e02c_kurento.WebRtcEndpoint","type":"OnIceCandidate"}}}
-> f3b4f17e-d7e1-44d6-aec5-e0106ce37c50
EventHandler.cpp:52 sendEvent() Sending event: {"jsonrpc":"2.0","method":"onEvent","params":{"value":{"data":{"candidate":

{"__module__":"kurento","__type__":"IceCandidate","candidate":"candidate:2 1 UDP 1677721855 130.206.UNK.KNO 58764 typ srflx raddr 192.168.LO.CAL rport 58764","sdpMLineIndex":1,"sdpMid":"video"}

,"source":"235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/4d01d709-1471-4fa6-b889-b3a79cb4e02c_kurento.WebRtcEndpoint","tags":[],"timestamp":"1449959528","type":"OnIceCandidate"},"object":"235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/4d01d709-1471-4fa6-b889-b3a79cb4e02c_kurento.WebRtcEndpoint","type":"OnIceCandidate"}}}
-> f3b4f17e-d7e1-44d6-aec5-e0106ce37c50
Transport.cpp:484 processMessage() Response: >{"id":22,"jsonrpc":"2.0","result":{"sessionId":"f3b4f17e-d7e1-44d6-aec5-e0106ce37c50","value":null}}
EventHandler.cpp:52 sendEvent() Sending event: {"jsonrpc":"2.0","method":"onEvent","params":{"value":{"data":{"candidate":

{"__module__":"kurento","__type__":"IceCandidate","candidate":"candidate:3 1 UDP 1006633215 130.206.REM.OTE 52131 typ relay raddr 192.168.LO.CAL rport 58764","sdpMLineIndex":0,"sdpMid":"audio"}

,"source":"235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/4d01d709-1471-4fa6-b889-b3a79cb4e02c_kurento.WebRtcEndpoint","tags":[],"timestamp":"1449959528","type":"OnIceCandidate"},"object":"235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/4d01d709-1471-4fa6-b889-b3a79cb4e02c_kurento.WebRtcEndpoint","type":"OnIceCandidate"}}}
-> f3b4f17e-d7e1-44d6-aec5-e0106ce37c50
EventHandler.cpp:52 sendEvent() Sending event: {"jsonrpc":"2.0","method":"onEvent","params":{"value":{"data":{"candidate":

{"__module__":"kurento","__type__":"IceCandidate","candidate":"candidate:3 1 UDP 1006633215 130.206.REM.OTE52131 typ relay raddr 192.168.LO.CAL rport 58764","sdpMLineIndex":1,"sdpMid":"video"}

,"source":"235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/4d01d709-1471-4fa6-b889-b3a79cb4e02c_kurento.WebRtcEndpoint","tags":[],"timestamp":"1449959528","type":"OnIceCandidate"},"object":"235a7f0a-87c0-4b8d-a726-e91b7095ea7b_kurento.MediaPipeline/4d01d709-1471-4fa6-b889-b3a79cb4e02c_kurento.WebRtcEndpoint","type":"OnIceCandidate"}}}
-> f3b4f17e-d7e1-44d6-aec5-e0106ce37c50
Transport.cpp:543 closeHandler() Connection closed
Transport.cpp:504 openHandler() Client connected from http://localhost:8080

Thanks !

EDIT : installed packages/version

gstreamer1.5-libav:amd64/1.5.2.1~20150901123759.34.g07a7b16.trusty
gstreamer1.5-nice:amd64/0.1.7.1~20151125151103.10.ge060eb5.trusty
gstreamer1.5-plugins-bad:amd64/1.5.2.1~20150901123827.61.gced9e06.trusty
gstreamer1.5-plugins-base:amd64/1.7.0.1~20151125150805.140.g2b445d5.trusty
gstreamer1.5-plugins-good:amd64/.7.0.1~20151125150841.141.g0708286.trusty
gstreamer1.5-plugins-ugly:amd64/1.7.0.1~20151126085656.24.g9ec26a4.trusty
gstreamer1.5-pulseaudio:amd64/1.7.0.1~20151125150841.141.g0708286.trusty
gstreamer1.5-x:amd64/1.7.0.1~20151125150805.140.g2b445d5.trusty
kms-core-6.0/6.2.0.trusty
kms-elements-6.0/6.2.0.trusty
kms-filters-6.0/6.2.0.trusty
kms-jsonrpc-1.0/1.0.1.trusty
kmsjsoncpp/1.6.3~20151125151041.38.g263929e.trusty
kurento-media-server-6.0/6.1.0.trusty
libgstreamer-plugins-bad1.5-0:amd64/1.5.2.1~20150901123827.61.gced9e06.trusty
libgstreamer-plugins-base1.5-0:amd64/1.7.0.1~20151125150805.140.g2b445d5.trusty
libgstreamer1.5-0:amd64/1.7.0.1~20151125150753.298.g6d22bfb.trusty
libnice10:amd64/0.1.7.1~20151125151103.10.ge060eb5.trusty
openwebrtc-gst-plugins/0.10.0~20151125150950.100.g61cc54b.trusty