# Fail at MQTT connect **URL:** \ **Category:** Help\ **Tags:** mqtt\ **Created:** [November 10, 2019, 11:40pm UTC](https://forums.losant.com/t/fail-at-mqtt-connect/2353 "2019-11-10T23:40:17Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Francisco\_de\_Izaguir](https://avatars.discourse-cdn.com/v4/letter/f/e56c9b/32.png) [@Francisco\_de\_Izaguir](https://forums.losant.com/u/Francisco_de_Izaguir)\ **Post date:** [November 10, 2019, 11:40pm UTC](https://forums.losant.com/t/fail-at-mqtt-connect/2353/1 "2019-11-10T23:40:17Z")
Hi Dear. For a while, I can’t establish a connection with my device from MQTT clients. I’m not using a Losant client. Now I’m trying with MQTT.fx and MQTTbox. Using as: broker: [broker.losant.com:1883](http://broker.losant.com:1883) ID = 5c9e9b03d9882500089baf9f Username = Access Key Password = Access Secret Any help will be appreciated. Thanks Francisco ---
**Author:** ![JuliaKempf](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.losant.com/juliakempf/32/2446_2.png) [@JuliaKempf](https://forums.losant.com/u/JuliaKempf)\ **Post date:** [November 15, 2019, 3:01pm UTC](https://forums.losant.com/t/fail-at-mqtt-connect/2353/2 "2019-11-15T15:01:51Z")
Hi @Francisco_de_Izaguir, Could you explain a bit more about your intended use case and the issue you are seeing? Any screenshots of your integration configuration would also be helpful (Losant and the external broker). Thanks! Julia ---
**Author:** ![Francisco\_de\_Izaguir](https://avatars.discourse-cdn.com/v4/letter/f/e56c9b/32.png) [@Francisco\_de\_Izaguir](https://forums.losant.com/u/Francisco_de_Izaguir)\ **Post date:** [November 15, 2019, 3:55pm UTC](https://forums.losant.com/t/fail-at-mqtt-connect/2353/3 "2019-11-15T15:55:12Z")
Thankyou very much for your answer. I’m trying to connect to losant ![losantMQTTfx](https://us1.discourse-cdn.com/flex015/uploads/getstructure/original/2X/8/8dd4cc0498f57579360554ca14ccf4d58f132bb0.jpeg) via MQTT. Right now using the client MQTTfx. I attach an image. and the client Log. Anithing else just tellme please. Thanks. 2019-11-15 12:54:14,202 INFO — Start App : Style: LIGHT /styles/mqttfx\_theme\_light.css 2019-11-15 12:54:26,274 WARN — Updater : Unknown Host ‘‘[http://www.jensd.de/apps/mqttfx/appcast.xml](http://www.jensd.de/apps/mqttfx/appcast.xml)’’: 404 [www.jensd.de](http://www.jensd.de) 2019-11-15 12:54:26,277 INFO — ScriptingManager : Found action with name: Switch Fountain Test 2019-11-15 12:54:29,164 INFO — BrokerConnectorController : onConnect 2019-11-15 12:54:29,246 INFO — MqttFX ClientModel : MqttClient with ID 5c8b2257e6c6c5000c0ecf9c assigned. 2019-11-15 12:54:41,295 ERROR — MqttFX ClientModel : Error when connecting org.eclipse.paho.client.mqttv3.MqttException: MqttException at org.eclipse.paho.client.mqttv3.internal.ExceptionHelper.createMqttException(ExceptionHelper.java:38) ~[org.eclipse.paho.client.mqttv3-1.2.0.jar:?] at org.eclipse.paho.client.mqttv3.internal.ClientComms$ConnectBG.run(ClientComms.java:715) ~[org.eclipse.paho.client.mqttv3-1.2.0.jar:?] at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0\_181] at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0\_181] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(Unknown Source) ~[?:1.8.0\_181] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source) ~[?:1.8.0\_181] at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.8.0\_181] at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.8.0\_181] at java.lang.Thread.run(Unknown Source) [?:1.8.0\_181] Caused by: java.net.UnknownHostException: [broker.losant.com](http://broker.losant.com) at java.net.AbstractPlainSocketImpl.connect(Unknown Source) ~[?:1.8.0\_181] at java.net.PlainSocketImpl.connect(Unknown Source) ~[?:1.8.0\_181] at java.net.SocksSocketImpl.connect(Unknown Source) ~[?:1.8.0\_181] at java.net.Socket.connect(Unknown Source) ~[?:1.8.0\_181] at org.eclipse.paho.client.mqttv3.internal.TCPNetworkModule.start(TCPNetworkModule.java:84) ~[org.eclipse.paho.client.mqttv3-1.2.0.jar:?] at org.eclipse.paho.client.mqttv3.internal.ClientComms$ConnectBG.run(ClientComms.java:701) ~[org.eclipse.paho.client.mqttv3-1.2.0.jar:?] … 7 more 2019-11-15 12:54:41,309 ERROR — MqttFX ClientModel : Please verify your Settings (e.g. Broker Address, Broker Port & Client ID) and the user credentials! org.eclipse.paho.client.mqttv3.MqttException: MqttException at org.eclipse.paho.client.mqttv3.internal.ExceptionHelper.createMqttException(ExceptionHelper.java:38) ~[org.eclipse.paho.client.mqttv3-1.2.0.jar:?] at org.eclipse.paho.client.mqttv3.internal.ClientComms$ConnectBG.run(ClientComms.java:715) ~[org.eclipse.paho.client.mqttv3-1.2.0.jar:?] at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0\_181] at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0\_181] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(Unknown Source) ~[?:1.8.0\_181] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source) ~[?:1.8.0\_181] at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.8.0\_181] at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.8.0\_181] at java.lang.Thread.run(Unknown Source) [?:1.8.0\_181] Caused by: java.net.UnknownHostException: [broker.losant.com](http://broker.losant.com) at java.net.AbstractPlainSocketImpl.connect(Unknown Source) ~[?:1.8.0\_181] at java.net.PlainSocketImpl.connect(Unknown Source) ~[?:1.8.0\_181] at java.net.SocksSocketImpl.connect(Unknown Source) ~[?:1.8.0\_181] at java.net.Socket.connect(Unknown Source) ~[?:1.8.0\_181] at org.eclipse.paho.client.mqttv3.internal.TCPNetworkModule.start(TCPNetworkModule.java:84) ~[org.eclipse.paho.client.mqttv3-1.2.0.jar:?] at org.eclipse.paho.client.mqttv3.internal.ClientComms$ConnectBG.run(ClientComms.java:701) ~[org.eclipse.paho.client.mqttv3-1.2.0.jar:?] … 7 more 2019-11-15 12:54:41,321 INFO — ScriptsController : Clear console. 2019-11-15 12:54:41,322 ERROR — BrokerConnectService : MqttException ---
**Author:** ![JuliaKempf](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.losant.com/juliakempf/32/2446_2.png) [@JuliaKempf](https://forums.losant.com/u/JuliaKempf)\ **Post date:** [November 15, 2019, 6:22pm UTC](https://forums.losant.com/t/fail-at-mqtt-connect/2353/5 "2019-11-15T18:22:03Z")
Hi @Francisco_de_Izaguir, I downloaded MQTTfx in order to test the same configuration you have. I want to ensure I am executing the same steps you did to receive this error. Let’s begin on Losant’s side. I have a device, MQTT Device, that I have created. I first copy the device ID to use as the “Client ID” in MQTTfx: ![43%20PM](https://us1.discourse-cdn.com/flex015/uploads/getstructure/original/2X/3/3837226bac70a54739e47449ed1bea85ccd9ec0e.png) ![25%20PM](https://us1.discourse-cdn.com/flex015/uploads/getstructure/original/2X/a/a0d51be9c9872e73085dd09c3df8cf614219614a.png) Next, I create an [Access Key](https://docs.losant.com/applications/access-keys/) in Losant: ![20%20PM](https://us1.discourse-cdn.com/flex015/uploads/getstructure/original/2X/b/b75947cdd17788718aaa258665345b1d0d8b437d.png) And include the credentials provided as the “Username” and “Password” in MQTTfx: ![21%20PM](https://us1.discourse-cdn.com/flex015/uploads/getstructure/original/2X/6/68a375015e48ed8e7598b11c0b2122330253d117.png) Finally, when I click “Connect,” in MQTTfx, I can see on my device page that I have successfully connected to Losant: ![55](https://us1.discourse-cdn.com/flex015/uploads/getstructure/original/2X/9/95efb10d372b7f4ab6eda70935dfb60885d71ffd.gif) Below are my logs in MQTTfx: ![59%20PM](https://us1.discourse-cdn.com/flex015/uploads/getstructure/original/2X/4/490a662d6879ccf14f187dc8fccf45fec5961cd1.png) I am curious, is this the same process you followed? Does the “Connect” button fail to work, and result in the logs you have included? Thanks! Julia ---
**Author:** ![Francisco\_de\_Izaguir](https://avatars.discourse-cdn.com/v4/letter/f/e56c9b/32.png) [@Francisco\_de\_Izaguir](https://forums.losant.com/u/Francisco_de_Izaguir)\ **Post date:** [November 16, 2019, 6:59pm UTC](https://forums.losant.com/t/fail-at-mqtt-connect/2353/6 "2019-11-16T18:59:25Z")
@JuliaKempf Thank you very much for your time. Indeed I am doing exactly that. At this moment I open MQTTfx and click over “Connect” and it actually connect. I don’t know what could it be. I tryied hard before post, so I can’t understand what is going on. May be some flapping server? Any way, thank you very very much. ---
**Author:** ![Lars\_Andersson](https://avatars.discourse-cdn.com/v4/letter/l/f05b48/32.png) [@Lars\_Andersson](https://forums.losant.com/u/Lars_Andersson)\ **Post date:** [August 20, 2020, 1:43pm UTC](https://forums.losant.com/t/fail-at-mqtt-connect/2353/8 "2020-08-20T13:43:19Z")
Did this ever get resolved? Trying using MQTTBox right now so I’m curious. ---
**Author:** ![Francisco\_de\_Izaguir](https://avatars.discourse-cdn.com/v4/letter/f/e56c9b/32.png) [@Francisco\_de\_Izaguir](https://forums.losant.com/u/Francisco_de_Izaguir)\ **Post date:** [August 20, 2020, 3:23pm UTC](https://forums.losant.com/t/fail-at-mqtt-connect/2353/10 "2020-08-20T15:23:39Z")
Hi Lars! I tried creating a new device and that worked just fine. I couldn’t find what I was doing wrong.