I'm using Plex Media Server Version 220.127.116.1129 for ReadyNAS and the latest AppleTV App build.
Frequently this NAS is at a premise with no internet connection.
While connected to the internet I have signed into the AppleTV app, and tested playing items, this works.
I also have added my subnet of IPs into the "List of IP addresses and networks that are allowed without auth" field.
Plex Home is off, and the server has a single user.
Later with no internet.
When I try to play items in the library, it starts and then gives the "resource loader error". The error message is very persistent and doesn't stay away, so you can't watch anything.
Is it now the case that Plex AppleTV REQUIRES internet to function correctly?
If that is true, that sucks. Looks like its back to SMB shares to play content.