That sounds very much like the announcement from late September that certain vendors will no longer update older platforms for compatibility with current network security requirements. With LG that should apply to all Smart TVs which aren’t updated to WebOS 5.0 (e.g. because they don’t support that version).
If you’re ok with that you can configure your server to disable secure connections – this should allow your TV to connect to your server (though that’ll apply to all connections between your server and clients).
