Anyone have experience getting Plex to work with AT&T Fiber?
A year ago, I signed on to AT&T Fiber and was able to get Plex to play outside of my home network. About a week ago, I upgraded and replaced parts to my home server. Had to rebuild my Plex container via Proxmox. Now, the traditional instructions do not allow me to access the Plex server outside my home network.
I have worked with AT&T support to make sure everything is good on their end.
1.) TCP/UDP has been enabled on my home modem/router. I am using AT&T provided router model BGW620-700
2.) NAT/Gaming works on another device on my home network, I run FoundryVTT, works perfectly fine
3.) Within Ubuntu that is running Plex, UFW is enabled and allows 32400 UDP and TCP.
4.) I am using AT&T Fiber which does not have a CGNAT, nor does my setup use a secondary router so Double NAT is not the issue as well.
5.) For a brief moment, I don't know what happened but I was able to access the Plex server via my phone's mobile data plan for exactly 1 minute, then it timed out.
6.) From Plex > Settings > Remote Access, It says I am able to access it, I have specified port 32400.
7.) I checked canyouseeme and it reports back as totally fine.
I could use some assistance or a direction to check, when I set this up about a year ago. I just used Plex's default documentation and everything functioned perfectly.
Edit 10/3/26 7:40 PM PST
Solved. Thank you to u/ExtensionMarch6812, All settings were correct except the .p12 cert. Had to navigate to:
sudo systemctl stop plexmediaserver
cd /var/lib/plexmediaserver/Library/Application Support/Plex Media Server/Cachemv certificate.p12 certificate.p12.oldsudo systemctl start plexmediaserver