# Getting "Connection Refused: not authorised" when trying to use MQTT **URL:** \ **Category:** Application Development\ **Created:** [October 3, 2017, 3:40pm UTC](https://www.thethingsnetwork.org/forum/t/getting-connection-refused-not-authorised-when-trying-to-use-mqtt/9863 "2017-10-03T15:40:07Z")\ **Posts on this page:** 18\ **Page:** 1
**Author:** ![gandipg](https://www.thethingsnetwork.org/forum/letter_avatar_proxy/v4/letter/g/ecd19e/32.png) [@gandipg](https://www.thethingsnetwork.org/forum/u/gandipg)\ **Post date:** [October 3, 2017, 3:40pm UTC](https://www.thethingsnetwork.org/forum/t/getting-connection-refused-not-authorised-when-trying-to-use-mqtt/9863/1 "2017-10-03T15:40:07Z")
Hello can you help me with configuring MQTT because what I find in your site still gives me a mistake ---
**Author:** ![BoRRoZ](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/borroz/32/44234_2.png) [@BoRRoZ](https://www.thethingsnetwork.org/forum/u/BoRRoZ)\ **Post date:** [October 3, 2017, 3:40pm UTC](https://www.thethingsnetwork.org/forum/t/getting-connection-refused-not-authorised-when-trying-to-use-mqtt/9863/2 "2017-10-03T15:40:59Z")
that’s not enough[info](https://status.thethings.network/) 😉 ---
**Author:** ![gandipg](https://www.thethingsnetwork.org/forum/letter_avatar_proxy/v4/letter/g/ecd19e/32.png) [@gandipg](https://www.thethingsnetwork.org/forum/u/gandipg)\ **Post date:** [October 3, 2017, 3:45pm UTC](https://www.thethingsnetwork.org/forum/t/getting-connection-refused-not-authorised-when-trying-to-use-mqtt/9863/3 "2017-10-03T15:45:52Z")
by starting this `$mosquitto_sub -h eu.thethings.network -d -t '.../devices/../up'` he wrote this to me –Connection Refused: not authorised. I am recording and a pass a user still gives me this ---
**Author:** ![arjanvanb](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/arjanvanb/32/46626_2.png) [@arjanvanb](https://www.thethingsnetwork.org/forum/u/arjanvanb)\ **Post date:** [October 3, 2017, 4:58pm UTC](https://www.thethingsnetwork.org/forum/t/getting-connection-refused-not-authorised-when-trying-to-use-mqtt/9863/4 "2017-10-03T16:58:12Z")
> [@gandipg](#): > > pass a user Your command line doesn’t show that. What are you using as the user, and what as the password? (So: show us that you’ve in fact read the documentation and tell us which documentation you’re using, rather than expecting people to list all possible problems.) As an aside, `'.../devices/.../up'` is wrong too. ---
**Author:** ![nicbkw](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/nicbkw/32/44893_2.png) [@nicbkw](https://www.thethingsnetwork.org/forum/u/nicbkw)\ **Post date:** [October 3, 2017, 4:59pm UTC](https://www.thethingsnetwork.org/forum/t/getting-connection-refused-not-authorised-when-trying-to-use-mqtt/9863/5 "2017-10-03T16:59:05Z")
You need to provide an access token, similar to this: `mosquitto_sub -h eu.thethings.network -t '+/devices/+/events/activations' -u 'APP-ID' -P 'ACCESS-KEY' -v -p 1883` APP-ID is the actual name of your application. ACCESS-KEY can be retrieved from the Overview page of your application (at the bottom) ---
**Author:** ![gandipg](https://www.thethingsnetwork.org/forum/letter_avatar_proxy/v4/letter/g/ecd19e/32.png) [@gandipg](https://www.thethingsnetwork.org/forum/u/gandipg)\ **Post date:** [October 3, 2017, 6:09pm UTC](https://www.thethingsnetwork.org/forum/t/getting-connection-refused-not-authorised-when-trying-to-use-mqtt/9863/6 "2017-10-03T18:09:31Z")
in this option I write it `mosquitto_sub -h eu.thethings.network -t '+/devices/+/events/activations' -u '70...................81' -P 'AB.......................E3' -v -p 1883` and yet it gives me a mistake Connection Refused: not authorised. Connection Refused: not authorised. ---
**Author:** ![gandipg](https://www.thethingsnetwork.org/forum/letter_avatar_proxy/v4/letter/g/ecd19e/32.png) [@gandipg](https://www.thethingsnetwork.org/forum/u/gandipg)\ **Post date:** [October 3, 2017, 6:19pm UTC](https://www.thethingsnetwork.org/forum/t/getting-connection-refused-not-authorised-when-trying-to-use-mqtt/9863/7 "2017-10-03T18:19:42Z")
I use this documentation from my site [https://www.thethingsnetwork.org/docs/applications/mqtt/quick-start.html](https://www.thethingsnetwork.org/docs/applications/mqtt/quick-start.html) ---
**Author:** ![kersing](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/kersing/32/44777_2.png) [@kersing](https://www.thethingsnetwork.org/forum/u/kersing)\ **Post date:** [October 3, 2017, 7:40pm UTC](https://www.thethingsnetwork.org/forum/t/getting-connection-refused-not-authorised-when-trying-to-use-mqtt/9863/8 "2017-10-03T19:40:54Z")
> [@gandipg](#): > > `-u '70…81' -P 'AB…E3'` Read the manual again. > [@](#): > > `-u "< AppID >" -P "< AppKey >"` AppID == Application ID, that should be a short ‘name’, listed at the top of all information on the **application** page. It is **not** an EUI number. AppKey should start with ttn-account-. ---
**Author:** ![nicbkw](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/nicbkw/32/44893_2.png) [@nicbkw](https://www.thethingsnetwork.org/forum/u/nicbkw)\ **Post date:** [October 3, 2017, 7:42pm UTC](https://www.thethingsnetwork.org/forum/t/getting-connection-refused-not-authorised-when-trying-to-use-mqtt/9863/9 "2017-10-03T19:42:05Z")
I think you are using appeui not the actual application name as your user. Also, check you are using the access key, starting with ttn-account ---
**Author:** ![gandipg](https://www.thethingsnetwork.org/forum/letter_avatar_proxy/v4/letter/g/ecd19e/32.png) [@gandipg](https://www.thethingsnetwork.org/forum/u/gandipg)\ **Post date:** [October 3, 2017, 8:03pm UTC](https://www.thethingsnetwork.org/forum/t/getting-connection-refused-not-authorised-when-trying-to-use-mqtt/9863/10 "2017-10-03T20:03:03Z")
thank you all it finally came about he has been stirring all the time `-u "" -P ""` 🍻 ---
**Author:** ![pramodmynampati](https://www.thethingsnetwork.org/forum/letter_avatar_proxy/v4/letter/p/94ad74/32.png) [@pramodmynampati](https://www.thethingsnetwork.org/forum/u/pramodmynampati)\ **Post date:** [March 9, 2018, 6:03pm UTC](https://www.thethingsnetwork.org/forum/t/getting-connection-refused-not-authorised-when-trying-to-use-mqtt/9863/11 "2018-03-09T18:03:11Z")
Hello all, I started playing with the Things Network recently. I have successfully connected my device to the TTN and am able to see the packets being received by the TTN server on its application console. However when trying to use MQTT (through mosquitto) on my laptop I am facing the same problem which @gandipg suffered. On my laptop I am entering the following cmd as mentioned in the Quick start tutorial `mosquitto_sub -h ev.thethings.network -t '+/devices/+/up' -u '2222' -P '...16 byte...' -v` I am getting Connection Refused: not authorised. Now Mr @nicbkw mentioned that the access key starts with ttn-account. On my application console my access-key doesn’t seem to start with that anywhere. Any clues as to where I am going wrong. Your help would be appreciated. Kind Regards ---
**Author:** ![arjanvanb](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/arjanvanb/32/46626_2.png) [@arjanvanb](https://www.thethingsnetwork.org/forum/u/arjanvanb)\ **Post date:** [March 9, 2018, 6:12pm UTC](https://www.thethingsnetwork.org/forum/t/getting-connection-refused-not-authorised-when-trying-to-use-mqtt/9863/12 "2018-03-09T18:12:25Z")
> [@pramodmynampati](#): > > ev.thethings.network That doesn’t look right. What region would `ev` be? > [@pramodmynampati](#): > > On my application console my access-key doesn’t seem to start with that anywhere. I just created a new application, and it still creates keys with that prefix. Maybe you can add a new key (for at least “messages”) to fix that? If not, create a new application? ![image](https://www.thethingsnetwork.org/forum/uploads/default/original/2X/2/2974a0cf18860c14d631a7af7231c7249939378d.jpg) Also, it’s a lot longer than 16 bytes, for me it’s 58 characters. ---
**Author:** ![nicbkw](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/nicbkw/32/44893_2.png) [@nicbkw](https://www.thethingsnetwork.org/forum/u/nicbkw)\ **Post date:** [March 9, 2018, 6:45pm UTC](https://www.thethingsnetwork.org/forum/t/getting-connection-refused-not-authorised-when-trying-to-use-mqtt/9863/13 "2018-03-09T18:45:16Z")
Quick response as I am in the pub… If your application is called ‘2222’, then in the console open the overview for the application and it should look similar to this, just copy the key using the icon: ![Screenshot_20180309-183712](https://www.thethingsnetwork.org/forum/uploads/default/original/2X/1/1d8f8c735733da736a8c7dee8de0ce0e78a5666f.png) ---
**Author:** ![pramodmynampati](https://www.thethingsnetwork.org/forum/letter_avatar_proxy/v4/letter/p/94ad74/32.png) [@pramodmynampati](https://www.thethingsnetwork.org/forum/u/pramodmynampati)\ **Post date:** [March 10, 2018, 3:36pm UTC](https://www.thethingsnetwork.org/forum/t/getting-connection-refused-not-authorised-when-trying-to-use-mqtt/9863/14 "2018-03-10T15:36:26Z")
Thank you both for your quick response. @nicbkw - thank you for suggestion for looking at the overview of the console. That resolved the issue. My mistake was to be entering the App Session Key for the device I registered. @arjanvanb - ‘ev’ is a typo on my part when writing the question on this forum. I was using ‘eu’ as the region. Regards ---
**Author:** ![bl00dy](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/bl00dy/32/36752_2.png) [@bl00dy](https://www.thethingsnetwork.org/forum/u/bl00dy)\ **Post date:** [June 5, 2020, 7:39am UTC](https://www.thethingsnetwork.org/forum/t/getting-connection-refused-not-authorised-when-trying-to-use-mqtt/9863/15 "2020-06-05T07:39:45Z")
Hello, when I try to connect with MQTT, getting “Connection Refused: not authorised.” but it was worked before. I am sure I use correct applikation Key, even I try to create new. mosquitto\_sub -h eu.thethings.network -t ‘+/devices/+/events/activations’ -u ‘70B3D57ESKIPPED’ -P ‘ttn-account-v2.skipped’ -v ---
**Author:** ![kersing](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/kersing/32/44777_2.png) [@kersing](https://www.thethingsnetwork.org/forum/u/kersing)\ **Post date:** [June 5, 2020, 8:14am UTC](https://www.thethingsnetwork.org/forum/t/getting-connection-refused-not-authorised-when-trying-to-use-mqtt/9863/16 "2020-06-05T08:14:47Z")
For the user you need to use the application ID (short text string). ---
**Author:** ![bl00dy](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/bl00dy/32/36752_2.png) [@bl00dy](https://www.thethingsnetwork.org/forum/u/bl00dy)\ **Post date:** [June 5, 2020, 8:22am UTC](https://www.thethingsnetwork.org/forum/t/getting-connection-refused-not-authorised-when-trying-to-use-mqtt/9863/17 "2020-06-05T08:22:58Z")
Hello, Yes. I use EUIS Ed ---
**Author:** ![bl00dy](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/bl00dy/32/36752_2.png) [@bl00dy](https://www.thethingsnetwork.org/forum/u/bl00dy)\ **Post date:** [June 5, 2020, 8:29am UTC](https://www.thethingsnetwork.org/forum/t/getting-connection-refused-not-authorised-when-trying-to-use-mqtt/9863/18 "2020-06-05T08:29:50Z")
Ok. thanks seems it’s working now with application ID. but I remember it’s worked before with EUIS