Unresponsive Raspi 3B on 64bit system – how to best diagnose it?

[kkom]

A little update for everyone who helped me here – the issues wasn’t in 64 bit system, 3B downgrade or migration to Buster!

I created a new topic to discuss my findings without the confusion of our earlier exchange here:

Large number of forwarded UDP ports break the device

I isolated this line as the cause of issues with my device: ports: (...) - "5656-5699:5656-5699/udp" When this range of 44 UDP ports is published in addition to the existing 3 UDP and 6 TCP ports, I am unable to access my service via the 8443/TCP port. I don’t know if this is because 8443/TCP is no longer published correctly, or because the device gets broken in a different way… I can think of two possibilities now: My syntax for publishing multiple UDP ports is incorrect… B…