# Producer connection state stuck to "checking" **URL:** \ **Category:** mediasoup libraries\ **Created:** [July 15, 2020, 6:20pm UTC](https://mediasoup.discourse.group/t/producer-connection-state-stuck-to-checking/1439 "2020-07-15T18:20:28Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![ArcDexx](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/arcdexx/32/1040_2.png) [@ArcDexx](https://mediasoup.discourse.group/u/ArcDexx)\ **Post date:** [July 15, 2020, 6:20pm UTC](https://mediasoup.discourse.group/t/producer-connection-state-stuck-to-checking/1439/1 "2020-07-15T18:20:28Z")
I am using the [mediasoup-client-android](https://github.com/haiyangwu/mediasoup-client-android) with [socket.io](http://socket.io). Here is my sendTransportListener : ```auto val listener = object: SendTransport.Listener { override fun onConnect(transport: Transport?, dtlsParameters: String?) { val params = JSONObject() params.put("method", "connectWebRtcTransport") val data = JSONObject() data.put("transportId", sendTransport.id) data.put("dtlsParameters", dtlsParameters) params.put("data", data) socket.send("request", params) } override fun onProduce(transport: Transport?, kind: String?, rtpParameters: String?, appData: String?): String { val params = JSONObject() params.put("method", "produce") val data = JSONObject() data.put("transportId", sendTransport.id) data.put("kind", kind) data.put("rtpParameters", JSONObject(rtpParameters)) data.put("appData", appData) params.put("data", data) val latch = CountDownLatch(1) socket.emit("request", params, Ack { args -> val idObj = args.firstOrNull { arg -> arg is JSONObject } as JSONObject sendTransportRemoteId = idObj.getString("id") latch.countDown() }) latch.await() Log.i("Socket", "Returning = $sendTransportRemoteId // Thread = ${Thread.currentThread().name} // State = ${transport?.connectionState}") return sendTransportRemoteId } override fun onConnectionStateChange(transport: Transport?, connectionState: String?) { Log.i("Socket", "Send Transport : ${transport.toString()}, connectionState : $connectionState") } } ``` ---
**Author:** ![ethand91](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/ethand91/32/14_2.png) [@ethand91](https://mediasoup.discourse.group/u/ethand91)\ **Post date:** [July 16, 2020, 12:58am UTC](https://mediasoup.discourse.group/t/producer-connection-state-stuck-to-checking/1439/2 "2020-07-16T00:58:56Z")
Does “latch.countDown” run? ---
**Author:** ![ArcDexx](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/arcdexx/32/1040_2.png) [@ArcDexx](https://mediasoup.discourse.group/u/ArcDexx)\ **Post date:** [July 16, 2020, 7:56am UTC](https://mediasoup.discourse.group/t/producer-connection-state-stuck-to-checking/1439/3 "2020-07-16T07:56:40Z")
Yes, the log shows the correct producerId is returned. ---
**Author:** ![ethand91](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/ethand91/32/14_2.png) [@ethand91](https://mediasoup.discourse.group/u/ethand91)\ **Post date:** [July 22, 2020, 9:41am UTC](https://mediasoup.discourse.group/t/producer-connection-state-stuck-to-checking/1439/4 "2020-07-22T09:41:28Z")
I’m assuming the checking state is the SendTransport not the producer. Does it not change to failed after a while? Does anything interesting popup on the server side with mediasoup debug logs enabled? Have you set up the webrtc transport listen Ips on the server side to the correct ip? ---
**Author:** ![ArcDexx](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/arcdexx/32/1040_2.png) [@ArcDexx](https://mediasoup.discourse.group/u/ArcDexx)\ **Post date:** [July 23, 2020, 2:04pm UTC](https://mediasoup.discourse.group/t/producer-connection-state-stuck-to-checking/1439/5 "2020-07-23T14:04:31Z")
- You are correct, it is the SendTransport that is stuck in “checking” state. - It does switch to “failed” after a while, although not in a predictable way. - The logs are the same when I successfully connect with my browser implementation. - No problem when connecting from browser, including mobile browser, so I would assume everything is properly set server wise. Unrelated issue but it might help in resolving : I am also unable to consume anything as I never get the “newConsumer” events. It is odd since I do receive other events such as “newPeer” or “activeSpeaker”… ---
**Author:** ![jmillan](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/jmillan/32/9_2.png) [@jmillan](https://mediasoup.discourse.group/u/jmillan)\ **Post date:** [July 23, 2020, 4:10pm UTC](https://mediasoup.discourse.group/t/producer-connection-state-stuck-to-checking/1439/6 "2020-07-23T16:10:07Z")
> override fun onConnect(transport: Transport?, dtlsParameters: String?) `dtlsParameters` are not a `String` in [libmeidasoupclient](https://mediasoup.org/documentation/v3/mediasoup/api/#WebRtcTransportDtlsParameters) On the other hand, you may need to trace the network traffic (tcpdump, wireshark, or alike) and check that the ICE binding requests are being sent to mediasoup and replied back. ---
**Author:** ![tanaymondal](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/tanaymondal/32/579_2.png) [@tanaymondal](https://mediasoup.discourse.group/u/tanaymondal)\ **Post date:** [September 24, 2020, 12:04pm UTC](https://mediasoup.discourse.group/t/producer-connection-state-stuck-to-checking/1439/7 "2020-09-24T12:04:08Z")
I am also not getting “newConsumer” events. How did you resolve it? ---
**Author:** ![ArcDexx](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/arcdexx/32/1040_2.png) [@ArcDexx](https://mediasoup.discourse.group/u/ArcDexx)\ **Post date:** [June 11, 2021, 9:45am UTC](https://mediasoup.discourse.group/t/producer-connection-state-stuck-to-checking/1439/8 "2021-06-11T09:45:37Z")
It was a JSON escaping issue, resulting in wrongly formatted `rtpCapabilities` being sent. After solving that I did receive the `newConsumer` events. However, the same problem that I had originally is still there : for either `ReceiveTransport` or `SendTransport`, the `connectionState` will be stuck to `checking` even though server logs are showing successful ` transport.connect()` requests @jmillan Can you please elaborate on the network traffic tracing ? What should I be looking for exactly ? ---
**Author:** ![jmillan](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/jmillan/32/9_2.png) [@jmillan](https://mediasoup.discourse.group/u/jmillan)\ **Post date:** [June 14, 2021, 8:16am UTC](https://mediasoup.discourse.group/t/producer-connection-state-stuck-to-checking/1439/9 "2021-06-14T08:16:44Z")
> [@ArcDexx](#): > > `SendTransport` , the `connectionState` will be stuck to `checking` even though server logs are showing successful ` transport.connect()` requests A `checking` state is indicating that the connection is looking for a usable candiate pair. Look for the ICE candidates you are providing to mediasoup and check if those IP/port make sense. [https://w3c.github.io/webrtc-pc/#dom-rtcicetransportstate-checking](https://w3c.github.io/webrtc-pc/#dom-rtcicetransportstate-checking) This issue is related to your environment and not to mediasoup libraries. ---
**Author:** ![ArcDexx](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/arcdexx/32/1040_2.png) [@ArcDexx](https://mediasoup.discourse.group/u/ArcDexx)\ **Post date:** [June 14, 2021, 5:15pm UTC](https://mediasoup.discourse.group/t/producer-connection-state-stuck-to-checking/1439/11 "2021-06-14T17:15:52Z")
It turns out, the IP in the ICE candidates did NOT make sense after all ! I was able to fix it thanks to you. Thanks x1000000, you just made my week !