Playing movie local consumes internet data, why?

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Plex server and Smart TV on the same network sitting next to each other. Internet is via Verizon with unlimited data plan. Why would playing 1 movie locally on my network consume 15GB of my Verizon data plan? I that internet authentication is necessary. But why would my data plan be consumed watching a movie locally.?

Have you verified the playback/streaming is indeed happening locally?
If your home network is split into different subnets (e.g. with access points opening their own sub-network), Plex can consider that a remote connection. But even though there should be no internet traffic of that magnitude…

I have the same problem. To address this I bought a separate router and I connect the PLEX media server and my TVs to that with ROKU. But I now find that ROKU stops playing periodically saying there is not internet connection … even though it has been playing for hours without the internet being available. So I plug my media router into my internet router to satisfy ROKU. After a few minutes I unplug it so as not to consume my internet data and it continue to run for several hours then I go through the same dance. Any ideas? I don’t understand why this happens.

It’s your post. So I’m not necessarily surprised you have the same issue :wink:
Then again… you never got back to look into what’s causing this. If the PMS and your Roku are in the same network/subnet, Plex will not consume 15 GB for local streaming.

If you want to minimize your impact:

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