66 Minecraft update: Microsoft can ban players from all servers; reports on private servers now go straight to Microsoft (archive.ph) posted 2 years ago by altmehere 2 years ago by altmehere +66 / -0 35 comments share 35 comments share save hide report block hide replies
I get the impression that this is being done client-side, so the problem may not be detecting or communicating with a private LAN server; it could be the clients themselves being able to communicate over the Internet with Microsoft's servers.