NRF Cloud connection refused (-111) when using NB-IoT

RE: NRF Cloud connection refused (-111) when using NB-IoT

Maximilian Deubel — Wed, 03 Sep 2025 08:25:21 GMT

Error code -111 is ECONNREFUSED. This could be due to invalid login data. Please double check that you are using the correct sectag and device ID. If you need more info about how to onboard your devices, please refer to this new docs page: https://docs.nordicsemi.com/bundle/nrf-cloud/page/GettingStarted.html

RE: NRF Cloud connection refused (-111) when using NB-IoT

hbs52 — Thu, 24 Jul 2025 11:41:41 GMT

I have the exact same problem. Same firmware version. Happens in multi service example and asset tracker template

RE: NRF Cloud connection refused (-111) when using NB-IoT

AdrianT — Tue, 15 Jul 2025 08:17:11 GMT

I am using v3.0.1. UDP sample works with CONFIG_LTE_NETWORK_MODE_NBIOT_GPS added to prj.conf

RE: NRF Cloud connection refused (-111) when using NB-IoT

Maximilian Deubel — Mon, 14 Jul 2025 13:53:03 GMT

Hi Adrian! Could you confirm which SDK version you are using? Also, could you check if the UDP sample works with this network configuration?

Best regards,

Max.

RE: NRF Cloud connection refused (-111) when using NB-IoT

AdrianT — Mon, 14 Jul 2025 09:40:11 GMT

Same case happens with the multi service sample.

Also I noticed this warning log:

<wrn> nrf_modem_lib_netif: MTU query failed, error: -77, MTU: 0

RE: NRF Cloud connection refused (-111) when using NB-IoT

AdrianT — Mon, 14 Jul 2025 09:13:36 GMT

We have used nrf cloud multi service sample as a reference. Also not using the provisioning service.

I have tried deleting the device and re onboard it in nrf cloud. But still not getting refused connection.

Will try to use the base nrf cloud multi service sample with KConfig CONFIG_LTE_NETWORK_MODE_NBIOT_GPS=y set as the modification.

RE: NRF Cloud connection refused (-111) when using NB-IoT

Pascal Hdz — Mon, 14 Jul 2025 07:58:37 GMT

Ok, I would need to know more about other Kconfig variables you are enabling. Also, have you tried to delete the device and onboard it again using this new configuration? In case you used Provisioning service, please unclaim it also.

Did you based your application in one project from our samples or applications in the SDK? Have you tried to reproduce the issue with one of them? This would help me reproduce the issue on my side and help you better.

Pascal.

RE: NRF Cloud connection refused (-111) when using NB-IoT

AdrianT — Mon, 14 Jul 2025 07:00:24 GMT

Yes, the Device ID matches the logs and nrfcloud dashboard. We are using the same device but flashing a FW with NB-IoT only enabled.

We were able to make the device connect to nRF cloud successfully after a couple of hours of the device retrying to connect to NRF Cloud. Is there a better way to ensure that the device can easily connect after transitioning from a FW that uses LTE-M into NB-IoT? Thank you

RE: NRF Cloud connection refused (-111) when using NB-IoT

Pascal Hdz — Fri, 11 Jul 2025 14:22:15 GMT

Hello,

Could you double check that the device ID is the same as the one in nRF Cloud?
Sometimes there is a mismatch that leads to that error.

Pascal.

Arabic	Hebrew	Polish
Bulgarian	Hindi	Portuguese
Catalan	Hmong Daw	Romanian
Chinese Simplified	Hungarian	Russian
Chinese Traditional	Indonesian	Slovak
Czech	Italian	Slovenian
Danish	Japanese	Spanish
Dutch	Klingon	Swedish
English	Korean	Thai
Estonian	Latvian	Turkish
Finnish	Lithuanian	Ukrainian
French	Malay	Urdu
German	Maltese	Vietnamese
Greek	Norwegian	Welsh
Haitian Creole	Persian