# Node-red MQTT

**URL:** <https://www.thethingsnetwork.org/forum/t/node-red-mqtt/72799>\
**Category:** MQTT\
**Created:** [December 9, 2025, 4:24pm UTC](https://www.thethingsnetwork.org/forum/t/node-red-mqtt/72799 "2025-12-09T16:24:09Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![lora\_Obs-Banyuls](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/lora_obs-banyuls/32/35697_2.png) [@lora\_Obs-Banyuls](https://www.thethingsnetwork.org/forum/u/lora_Obs-Banyuls)\
**Post date:** [December 9, 2025, 4:24pm UTC](https://www.thethingsnetwork.org/forum/t/node-red-mqtt/72799/1 "2025-12-09T16:24:09Z")

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Hello, I’m using the TTN MQTT application. I’ve already connected to two applications, but I’m currently unable to connect a third using the Node-RED MQTT-in node. The console displays “failed to connect.” I’m using port 1883, so without TLS. Thank you for your help, Pierre

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**Author:** ![lora\_Obs-Banyuls](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/lora_obs-banyuls/32/35697_2.png) [@lora\_Obs-Banyuls](https://www.thethingsnetwork.org/forum/u/lora_Obs-Banyuls)\
**Post date:** [December 10, 2025, 11:04am UTC](https://www.thethingsnetwork.org/forum/t/node-red-mqtt/72799/2 "2025-12-10T11:04:17Z")

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it’s resolved sometimes when you copy eu1.cloud.thethings.network:1883 there is a space a the beggining you have to remove!

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**Author:** ![stevencellist](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/stevencellist/32/46434_2.png) [@stevencellist](https://www.thethingsnetwork.org/forum/u/stevencellist)\
**Post date:** [December 10, 2025, 11:22am UTC](https://www.thethingsnetwork.org/forum/t/node-red-mqtt/72799/3 "2025-12-10T11:22:05Z")

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A problem that severely frustrated a few of my students last year.. I really don’t understand why NodeRED doesn’t trim these spaces. Glad you figured it out 🙂

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**Author:** ![system](https://www.thethingsnetwork.org/forum/uploads/default/original/3X/6/2/6250ea44fd2b0d6259489e1a92748df681e1f970.png) [@system](https://www.thethingsnetwork.org/forum/u/system)\
**Post date:** [December 11, 2025, 11:23am UTC](https://www.thethingsnetwork.org/forum/t/node-red-mqtt/72799/4 "2025-12-11T11:23:01Z")

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