After a recent update I was unable to download any video files from my server to any of my devices. Downloads had worked previously, but suddenly started failing. I found a post on another website that explained the problem and how to remedy it. It seems the root cause of this issue is Plex uses DNS rebinding for its plex.direct domain, which is used to download media for offline viewing. The first solution is to change the DNS servers that are defined by your router. Many users may be using their ISP DNS server, which would mitigate DNS rebinding attacks. These mitigations would prevent Plex from downloading media for offline viewing. By changing my iPad’s DNS Servers to Cloudflare (1.1.1.1 and 1.0.0.1) the problem was resolved. Fix: Plex Media Server Offline Download Not Working - Plexopedia
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