I believe that I found the solution to my particular “Playback Error: This live TV session has ended” problem when using Plex Web.
Months ago, and for other reasons, I had enabled the experimental option "Use alternate streaming protocol for video playback” in Settings - Plex Web - Debug. I had left it enabled. Beginning with PMS 1.24.5.5173, which incidentally fixed a live tv playback error with Android, the server began dropping the Plex Web live tv stream after several minutes. The Dashboard didn’t even show that the session was playing when the channel was first tuned.
I turned off that option and now it seems to be working fine. Thought I drop this here in case it helps others. Please reference the forum link above for more information or comment. No need to comment here as it’s now off-topic.
