MQTT device can't connect

Can’t connect my device 5bf2d0b6e7b43a0007eb2807 via MQTT anymore.
Tried changing access key, but didn’t help.

How can I track down what’s failing?

If you are using secure MQTT, ie. port 8883, then it’s likely the Root CA certificate change
discussed in other threads.
If your device logs errors, that would be a start.
If you can use a protocol analyzer like wireshark, that would help short-circuit the guesswork.
It would indicate that the SSL handshake fails if it’s due to certificate verification.
If it gets past that, then there should be authentication failures in the platform logs.

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It was the RootCa file

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@Lars_Andersson glad it’s back to working, thanks for your patience!