Server is on LAN but traffic keeps going out and then back on WAN when streaming/downloading

Plex Media Server Desktops & Laptops
1

Server Version#: 3.108.2
Player Version#:chrome 76.0.3809.100

I’ve got a problem here with my plex server which was previously located at a remote location and now has been moved to my premises. My computer and the server are on the same subnet, and I’ve checked all possible options to ensure when I access it through https://app.plex.tv/desktop without using my WAN with no success.

The only way around is to access the LAN address of the server, that means I would also need to reconfigure all ROKU devices and mobile apps to do the same.

If there any work around to ensure the servers detects players are on the same LAN subnet and provide LAN traffic?

2

DNS issues and/or DNS rebinding protection.
Both can possibly be mitigated by changing some preferences in your router.

  1. switch the DNS server away from what is automatically assigned by your ISP to those provided by Google (8.8.8.8 and/or 8.8.4.4)
  2. look for a setting related to ‘DNS rebinding protection’ and create an exemption for the domain plex.direct (see https://support.plex.tv/articles/206225077-how-to-use-secure-server-connections/ for technical backgroud)
  3. Settings - Server - Network - ‘Show Advanced’ - “Treat WAN IP As LAN Bandwidth”

After making these settings,
restart your router first
wait a few minutes
then reboot your server machine
wait another few minutes
reboot your clients

(And I mean “minutes”, not mere seconds)

3

changing DNS servers instead of using my firewall (pfsense) to resolve DNS has done the trick, thanks!

1 Like
4

You can keep on using pfsense if you implement the DNS rebinding parameters into it.

5

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