# Can't connect to Zigbee2MQTT MQTT Server

**URL:** <https://discourse.nodered.org/t/cant-connect-to-zigbee2mqtt-mqtt-server/70743>\
**Category:** General\
**Tags:** mqtt\
**Created:** [16 November 2022 21:40 UTC](https://discourse.nodered.org/t/cant-connect-to-zigbee2mqtt-mqtt-server/70743 "2022-11-16T21:40:57Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![mikeg-de](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/mikeg-de/32/70864_2.png) [@mikeg-de](https://discourse.nodered.org/u/mikeg-de)\
**Post date:** [16 November 2022 21:40 UTC](https://discourse.nodered.org/t/cant-connect-to-zigbee2mqtt-mqtt-server/70743/1 "2022-11-16T21:40:57Z")

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Hi,

I have quite some troubles connecting to the MQTT Server from Zigbee2MQTT. I tried different methods but pretty much always get a "Connection refused" or MQTT offline.

![Bildschirmfoto_2022-11-16_um_22.16.37](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/b/9/b9febf103ccb19de2ca6b9d17ba3a4639f2f3d0e.jpeg)

 ![Bildschirmfoto_2022-11-16_um_22.17.16](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/d/d/dd6cfbeaec0c15474d7405936ac326534ac5c617.jpeg)

Hope anyone can help me spot my mistake or provide some guidance how to set things up the right way.

Many thanks in advance  
Mike

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**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [16 November 2022 21:59 UTC](https://discourse.nodered.org/t/cant-connect-to-zigbee2mqtt-mqtt-server/70743/2 "2022-11-16T21:59:08Z")

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Welcome to the forum @mikeg-de

I suggest not using that node. Just use the standard MQTT nodes configured with the appropriate topics. Also I suggest installing MQTTExplorer which is a great tool for checking what the topics should be.

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**Author:** ![mikeg-de](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/mikeg-de/32/70864_2.png) [@mikeg-de](https://discourse.nodered.org/u/mikeg-de)\
**Post date:** [16 November 2022 22:30 UTC](https://discourse.nodered.org/t/cant-connect-to-zigbee2mqtt-mqtt-server/70743/3 "2022-11-16T22:30:38Z")

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Thanks @Colin for your advice. I tried the standard MQTT nodes before which were formerly connected to the Test node and they couldn't connect either. Here is the former setup:

 ![Bildschirm­foto 2022-11-16 um 23.26.42](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/8/c/8c9ced4718c6d80fea99da7713948ed17ab1b052.jpeg)  
 ![Bildschirm­foto 2022-11-16 um 23.27.06](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/c/a/ca011b91ff87e59a70ed762edd330ddf51392810.jpeg)

I noticed the protocol version 3.1.1 is not but 5 is existing in Zigbee2MQTT.

Will check out the MQTTExplorer

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**Author:** ![bakman2](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/bakman2/32/6207_2.png) [@bakman2](https://discourse.nodered.org/u/bakman2)\
**Post date:** [17 November 2022 04:12 UTC](https://discourse.nodered.org/t/cant-connect-to-zigbee2mqtt-mqtt-server/70743/4 "2022-11-17T04:12:30Z")

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did you try the ip address instead ?

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**Author:** ![mikeg-de](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/mikeg-de/32/70864_2.png) [@mikeg-de](https://discourse.nodered.org/u/mikeg-de)\
**Post date:** [17 November 2022 06:55 UTC](https://discourse.nodered.org/t/cant-connect-to-zigbee2mqtt-mqtt-server/70743/5 "2022-11-17T06:55:51Z")

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Yes, I did.

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**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [17 November 2022 07:09 UTC](https://discourse.nodered.org/t/cant-connect-to-zigbee2mqtt-mqtt-server/70743/6 "2022-11-17T07:09:28Z")

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Why have you changed the broker node? Node red should still use mosquitto and zigbee2mqtt should be configured to use that broker.

Zigbee2mqtt connects zigbee devices to your mqtt broker.

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**Author:** ![mikeg-de](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/mikeg-de/32/70864_2.png) [@mikeg-de](https://discourse.nodered.org/u/mikeg-de)\
**Post date:** [17 November 2022 07:27 UTC](https://discourse.nodered.org/t/cant-connect-to-zigbee2mqtt-mqtt-server/70743/7 "2022-11-17T07:27:10Z")

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Good morning,

I tried different nodes if there was an issue with one Node Red extension. However, what you mentioned about mosquitto opened my eyes. I was so mislead with the MQTT Server option in Z2M that I totally forgot abotu mosquitto.

It works now. Many thanks @Colin!

Cheers  
Mike

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [1 December 2022 07:28 UTC](https://discourse.nodered.org/t/cant-connect-to-zigbee2mqtt-mqtt-server/70743/8 "2022-12-01T07:28:04Z")

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