Monitor firewall + connections app/web/etc?

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Monitor firewall + connections app/web/etc?

Does anyone know of a way I can monitor connections, specifically connection success/failures from the bulit-in firewall?

I'm having a weird issue where I can connect externally either from Chrome or from the Synology apps, but can connect on Firefox. I have CF setup as a proxy and it was giving me 522 errors until I turned off the firewall, so now Im not sure what is wrong with my firewall setting that suddenly caused things to get blocked.

I generally have US-only traffic allowed and other traffic blocked, so I suspect somewhere down the line traffic is either coming from non-US ip addresses like being re-routed somehow, or otherwise maybe using ipv6 and maybe I have this blocked somewhere.

In any case, I dont know how to troubleshoot this issue without visibilty into the connectivity. Anyone have any ideas on how to solve my issue or how to debug/monitor connections?

Thanks!
 
Maybe Wireshark can help?
I am pretty sure there is a way to install it via docker. Maybe it deserves a try.
 

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