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I have a RUT240 with firmware RUT2XX_R_00.01.12.2 . I configured the Teltonika to use the local MQTT broker and added  AWS IoT as MQTT bridge.

When I have WAN configured as WAN, meaning through ethernet cable the Teltonika can publish and subscribe to messages to and from AWS IoT. I can get the signal strength and connection, temperature etc. through MQTT remotely this way. Once I change to use the mobile network connection as WAN the MQTT connection to AWS IoT does not work anymore. Reboot did not help either.

Any support is greatly appreciated

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Hello,

Can you please PM me with troubleshoot file (System -> Administration -> Troubleshoot) when issue persist?

Also, when you use mobile WAN, can you ping 8.8.8.8 or 1.1.1.1 from router itself?

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After further testing, also with different Teltonika devices and SIM cards, I believe that it's an issue with one of the SIM cards. Thank you very much for your support and sorry for the inconveniences, I've caused.
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Understood, if you will have any more questions regarding this question, do not hesitate to ask.