Need explanation on how Plex works and if it will use my internet bandwidth.

There seems to be something wrong with my plex then. If everyone keeps saying it wont use data on a local machine. I have been playing videos off my plex on my ps4 locally by the ip address and it is using up my parents data. I just got a notice I have pushed there usage up to 75% even though I have only been watching locally. As a test i disconnected the internet from the router and plex will no longer work. For some reason its sending it out and back to my local machine. Am I missing something?

Disable ‘secure connections’ under Settings - Server - Network, then restart Plex Server and a few minutes later your Plex clients

You must make absolutely sure that your client device is on the same local subnet as your server. Some wireless routers do put all wireless devices into a different subnet. Verify the settings.
If you use several router devices ‘cascaded’, a part of your home network may also end up in a different subnet. You must have only one ‘router’, all other wireless ‘routers’ i your network must be put into ‘Access Point’ mode (disable NAT).

So the secure connection is causing it to go out of my local network and back in? why is that?

@dongfanglong said:
So the secure connection is causing it to go out of my local network and back in? why is that?

Not directly.
To use a Secure Connection, Plex needs to access your server with its FQDN, because the TLS certificate is ‘pinned’ to that.
The certificate is not valid for the private IP address and thus, the connection would fail.

But your router must allow the FQDN to get assigned to your server. Some don’t allow this. Some can be persuaded with a special configuration, some cannot.

Hence the first test is to disable Secure Connections.
Now you can try and make this special configuration work in your router.
Here is how https://support.plex.tv/hc/en-us/articles/206225077-How-to-Use-Secure-Server-Connections (scroll down to ‘DNS Rebinding’)

well its all on the same subnet. I turned off the setting and tested it again and it worked without internet. However i had to restart the video because it said it couldnt find the file. Is there some way to show if its sending traffic out?

@dongfanglong said:
Is there some way to show if its sending traffic out?

You would need to peruse your router’s user interface for info about that.
Or maybe your ISP provides a statistic which you can watch before and after playing a video.

I have the same problem. I use it only locally but many times I found Plex using my UPLOAD bandwidth almost saturating all my available bandwidth. How is this? I understand some download is required for metadata (though this should be limited to the newly added media when you update database)

But why all this bandwidth usage in upload. I am not talking about few pings or tech data
 I am talking about hundreds of Mb per day!!!
Can somebody explain?

@mmazzilli73 said:
I have the same problem. I use it only locally but many times I found Plex using my UPLOAD bandwidth almost saturating all my available bandwidth.

It has been explained above already.
Here is a shortened version: https://forums.plex.tv/discussion/comment/1448011/#Comment_1448011

I use PLEX exclusively at home to stream movies/series from my NAS to my Apple TV or Shield. Sometimes my PS3.

I have found that some times a movie just throws me the loading symbol midway through the movie and then just hangs. When I exit the movie and try to go back in (or play anything else) it tells me it can’t find the server. My Apple TV can’t find the NAS that is on the same wifi. I try restarting the Apple TV and the NAS and nope, no joy
 Then I discover my data cap is reached, I buy more data and voila
 suddenly PLEX is showing my movie again, right where I left off.

The question of “Does PLEX use your internet” is not even a question any more. The only question now is “How much data is PLEX using?”

I have 50Gb capped product but with free downloads during midnight and 6AM. I schedule my downloads for then and during the remaining 18 hours I use my internet exclusively for web surfing and emailing. I don’t even watch youTube because I want to preserve as much data as I can for the roll over in case I DO need to download something some time. That is how I use my internet
 Simply put: I don’t. I download torrents when my data is free and during the rest of the day I just email and surf


For relaxation the wife and I watch movies via Plex. Either in the bedroom with the aircon or the living room with the nice cold evening air coming from the open door. Hence either the Apple TV or the Shield. This month my 50Gb cap was reached by the 20th. Acccording to them I consistently upoaded between 30Mb and 90mb every single hour and downloaded between 550 and 950Mb very hour.

Considering the fact that I went to the livingroom to watch a movie, came back and found I had just used another 700MB of data I was understandably upset! the movie was about double that size so clearly the movie didn’t stream over the internet but I still managed to eat up half the movie size by watching a movie through the Shield which is connected to the router via ethernet. The NAS is connected to the router via the ethernet also. So from ethernet NAS to ethernet Shield to HDMI TV I use up 50% of the movie’s data in bandwidth AND upload 30to 60Mb also. WTF!?

Clearly this conversation is super old so why isn’t this resolved yet? Why can’t we just have a simple “local only” media player? how about a “Fetch meta info now” button and the rest of the time just NOT fetch the data?

Why force my movie to stop playing mid way through just because my internet cap was reached? I’m streaming from the NAS 2 rooms away
 not the bloody Ukraine! Why do I need internet to stream data from 2 rooms away? Why? Why can’t I just play the bloody movie without requiring the internet!? it’s already a pain in the ass to have to first log in via the internet before I can stream my local content but why the heck can’t you just stream without all the extras that eat up my internet data?

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