To reliably determine whether your Plex server is accessible externally, use YouGetSignal’s Port Forwarding Tester. and enter your Plex port (default 32400), or your own custom port if you have one set.
Do not use Plex’s “Remote Access” page to determine whether your server is accessible remotely, as this is exactly what is broken.
Note: The below is my hypothesis only.
I suspect some Plex Apps use “Remote Access” to see if the server is online or not.
If the Plex App is told by Plex’s “Remote Access” the server is offline, it won’t even try to connect.
Some apps have no issue connecting straight away, and I suspect that they try to hit the server directly (which has been online the whole time) and succeed in streaming.
This is why some Plex clients can still stream despite “Remote Access” Being unavailable in server settings.
