What tcp connections does Plex maintain?

Server Version#: 1.15.4.993
Player Version#: 3.95.2

What known tcp connections does Plex maintain, and why? I’ve found several IPs associated with Linode maintaining constant tcp connections to both of my Plex servers via port 443. I’m 99% certain these connections are via Plex, which I determined by bringing Plex up and down and watching the changes in established tcp connections.

I also found a few IPs associated with Plex directly that make connections to my PC when Plex is first started. I’m fine with that, it’s Plex. I see a lot of random machines trying to brute force their way into my servers from Linode IPs, so I’m suspicious of anything that comes from there.

My first question then is, does this sound accurate, can others confirm this? If this is Plex’s doing, then my next question is, what is going on here? Since it’s a connection via port 443, tcpdump doesn’t tell me much about what is happening with these connections.

For example, this IP in particular maintains a constant connection to my one server, even after rebooting and adding an iptables rule to drop the connection and block future attempts: 172.104.218.101

If you search these forums for linode you’ll get many related threads (and some spectacular conspiracy theories as well).

plex.tv will keep an eye on your server. So it can tell all entitled remote clients that it is available (or not). And under which public IP it can be reached. And some telemetry data as well, for diagnostic reasons.

a second usage for the linode servers is ‘relay’ connections.
https://support.plex.tv/articles/216766168-accessing-a-server-through-relay/

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