Plex allows users to store movie and TV show files on a server and then view those files on a wide variety of client devices including Macs, PCs, a number of smart televisions, the Roku box and the Apple TV. The server also connects to Internet databases to pull IMDB-type metadata on media.
The client, called PlexConnect, used a hack to get video from the Plex Media Server onto the Apple TV. A small Python program on the Mac intercepted DNS requests from the Movie Trailers app on the Apple TV and instead returned a custom XML feed that delivered a list of media and movie streams to the device.
Now, however, Apple has closed the loophole. Previously, the Trailers app used regular HTTP requests and the PlexConnect app intercepted those requests. Now, the Trailers app uses HTTPS and it is likely impossible for the Plex programmers to overcome it.
Plex CTO Elan Feingold told MacRumors that the company was "saddened to hear that PlexConnect stopped working" and that "we can only hope that in the future Apple decides to release an SDK for the ATV". "The level of interest in the project was quite high."