Some of the sites that were attempted to access by plex were blahblabh.eu.amazon something or other, and a few other sites which would resolve with various hostnames but not anything that would specifically indicate location on the globe.
I turned off the firewall rules and plex immediately started working again.
Why is plex accessing servers outside of the US, and are they specific enough that I can put in allow rules for them, or will they be rotating and/or randomly assigned and therefore I will forever be chasing my tail?
Plex uses the Amazon cloud for their services I believe. Like authentication, updates, etc… Amazon is probably load balancing if I had to guess. Why are you so against the World wide web?