Hi @Raj66 , thanks for stepping in, highly appreciated! Sorry it took a little to test again, it's not that easy to find a timeslot for a possible downtime. Just as you proposed, No-NAT was only enabled for the primary uplink and the MX was forced to switch to cellular. This time, I had a backup connection (on my laptop) to see what's going on in the dashboard. Unfortunately, it looked like cellular wasn't taking over this time at all so the connection was lost completely. Guess I'll have to step back and troubleshoot the cellular connection first.
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