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Hi Žygimantas,
I've attached the relevant images below. Thank you!
Block All Incoming Rule Config(1) Block All Incoming Rule Config(2) Selected Rules(1) Selected Rules(2) Selected Rules(3)
Hello,
The rule should work. I would advise you to check what traffic does tcpdump package register for your MQTT port to find where does this traffic originate from.
Best regards,
Žygimantas