Server is offline or unreachable after change provider internet

Plex Players Smart TVs
1

Server Version#: 1.18.2.2058
Player Version#: Plex for Smart TVs (Linux) 3.13.13

Hey there, since I changed my internet provider (to only a router), the Plex app on my TV SEMP L32S3900S can’t find the server, but on web or other Samsung TV it works. If I connect my SEMP TV to my phone’s hotspot internet or neighbors routers the server works. The problem seens to be with this new router, I don’t know. Can anybody help me please? I know basic about router settings.

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I don’t know about SEMP tv sets. Are you sure there is a genuine Plex app for this device?

What the new router may have caused, is a change in the DHCP IP range of the whole network. As your computers and devices in the local network are rebooted, they get different IP addresses assigned by the new router.

So the first thing you do is to reboot your Plex server.
After a few minutes, reboot all your other connected devices as well, to ensure they all have IPs from the new range and know about the new router.

Inspect your router’s settings menu. If there is a way to use a different ‘DNS server’ than the one from your ISP, change it to those from Google: 8.8.8.8 and/or 8.8.4.4

If you can find anything about ‘network separation’, ‘client separation’ or ‘AP separation’ in your router, disable it. If this is activated, your local clients may not get a direct connection to your server. You don’t want that.

Then look for something called ‘DNS rebinding protection’. If there is a way to define an exception from it, put in the domain plex.direct. This is necessary for secure connections in the local network.

Then open the Plex web app and go to
Settings - Server - Network - ‘Show Advanced’ - “List of IP addresses and networks that are allowed without auth”
Put in the network address which your new router uses for local devices, e.g. 192.168.78.0/24
(the /24 means the range spans the addresses 192.168.78.1 through 192.168.78.255)

Then stop and restart your Plex server once more and let it sit for a few hours.
Don’t expect immediate changes.
Updates to the DNS system may take a while, so don’t panic if success is not immediate.

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