Here’s some other items to check/try:
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Set your TV & server to use public DNS servers such as Google, (8.8.8.8, 8.8.4.4), Cloudflare (1.1.1.1), etc. This can help if you are using secure connections. See the DNS rebinding section of the Using Secure Connections support document.
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Disable IPv6 on the TV and Plex Server (Settings → Network).
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Allow Insecure Connections on your LAN
- Set the server for Preferred (Settings → Network → Secure Connections).
- Set the TV to use unsecured connections to your local server.
In the Plex app on my LG it is in Settings → Advanced. There are two settings, Allow Insecure Connections and Prefer Insecure Connections. Both set to On Same Network As Server.
It should be similar for a Samsung.
- Reboot your network.
- Shutdown your Plex server.
- Power off the TV and remove from AC power for ~20 seconds (so it fully powers off, not just sleeps).
- Power off / Power on your router.
- Once the router is fully back online, boot up the Plex server.
- Once the Plex server is back online, turn on the TV.
