I tried testing a movie from my home server in plex through firefox and repeatedly got this message, even after reloading.
I knew that they had paywalled the apps on mobile and streaming from outside the network but now they have also blocked watching your own movies through your own hardware.
I do get the point that making software should be able to sustain people but I dont see the move of plex as a fair thing to do. Yes, they have made great software but taking your home server hostage feels like the wrong move.
Even a pop up that says "we need you to donate please" would have been fine. make it pop up before every movie, play donation ads before any movie but straight up disabling the app is kinda cruel.
Anyway, i have switched to jellyfin and it is insanely good. please give it a try. you can run it alongside plex with not issues (at least i had none) and compare the two.
In any case, good luck. Let me know if you need help.
It all starts to make sense then. I need to set Jellyfin up soon. It's only a matter of time before they come after the "Lifetime" purchasers like myself. I bought it over a decade ago at this point.
the actual problem here is that OPs network is not configured correctly and that Plex detects that the physical local client is actually accessing the server from a totally other network.
Fairly common when you use docker to run Plex and have the container run in bridge mode. This will put the container in the docker network that will then be different to your local network.
Plex determines if a stream is local or remote based on the network so when your container is in bridge mode, the physical local client will be a remote connection because of the different networks.
And since remote streaming requires Plex pass since end of April, you will see this.
Yup, that's exactly the problem I have, it's ridiculous that it doesn't let me stream from a local network just because it thinks that it's local network is only the docker one, it should be fairly simple for Plex to figure out it's accessible via a direct connection and it doesn't need to route through the Plex servers for this. But it won't get fixed because it pushes people to pay, hell from what people are saying here the config to fix this is paywalled so they create a problem for which they sell you the solutions.