LG TV doesn't see plex media server

Server Version#: 1.20.4.3517-ab5e1197c_amd64.deb
Player Version#: Two different LG TVs

Plex is running on a Ubuntu 18.04 server on wired LAN. IP: 192.168.88.92
One TV is connected to the same wired LAN. IP: 192.168.88.39
Another TV is connected to the same LAN via Wi-Fi.

Both TVs don’t see the Plex server at all. No any traces. I restarted TVs just to be sure. At that - LAN and Internet work perfectly on the TVs. For example I can ping them from linux and I can play Netflix videos on them.

I don’t use any firewalls on Linux.

On Linux I can view files in the library and play them locally.
I open localhost:32400/web.

Any ideas why it doesn’t work?

In the Plex WebOS app settings you must allow insecure connections on LAN, as well as fall back. On Server side/Network/ Secure connections - Preferred. Also best not enabling IPv6 in Plex server and LG TV Network settings.

Manual server settings in Plex clients add your Server LAN IP and port (32400)

Thank you SE56! Where can find those settings?

P.S. And can I also disable everything else? Like: please don’t play that serious, be just a DLNA app for this folder on my LAN, seed its content, don’t ask questions, don’t require Internet, don’t log me or somebody in, just be simple? Or I need something else for that?

Did I not say so in previous post. Well it’s in general or advanced depend on version

It didn’t help actually. My TVs were not able to see anything.
But while I was digging in the settings I discovered that DLNA was SWITCHED OFF for some reason! Since this is a new account (and I manually killed other settings), it’s obvious that it was set to OFF by default. But as far as I understand, without DLNA TVs cannot see or play anything. This is so weird…

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