My son has recently created a Minecraft server in our home using a leftover PC.
He is using a whitelist to allow only his friends' legitimate accounts to join the game.
However, I have discovered that one of the friends is connecting with MineChat client.
I have read their site, and they seem like a legitimate app, but I don't want to allow any clients except the official Mojang(microsoft) clients.
Is there a way to prevent other clients like MineChat from connecting to my son's server?
This is a vanilla 1.8 server running on Debian behind my firewall, using NAT and a non-standard Minecraft port. Further, I have the domain running through the CloudFlare DNS, and I have not used their protections service yet, as I had to disable it for the friends to connect via Minecraft client.