I’m also on CGNAT and have remote Plex working on IPv6-only.
Aside from the FW rules, I also added a Custom Server URL to the Plex configuration as per this post.
Weirdly, the remote access page shows that the server is not accessible from the outside, which is NOT true.
Please note that it only works with iOS devices because for some reason Plex Android (or other platforms) doesn’t seem to support IPv6…
Overall, it just seems like the Plex team doesn’t consider IPv6 a priority AT ALL, despite the fact that CGNAT is becoming common around the world.
My kit:
Router is a Fritzbox 7530
Plex is running on a QNAP NAS
