How to Prevent Access to Minecraft Server from non-minecraft Clients?

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.

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How do you let people crack your Minecraft server?

How to Allow Cracked Clients to Join Your Minecraft Server

Log into the Scalacube website and go to your server control panel.

Click on Manage server > Manage > Settings > server. properties.

Change online-mode from true to false.

Save changes and restart your server.

Connect to your Minecraft server.

What Minecraft server allow cracked clients?

Stop your server.

Stop your server. ...

On your control panel, navigate to Files > Config Files.

On the Config Files page, select Server Settings.

Locate the option called Online Mode and select Disabled from the drop-down menu.

Scroll to the bottom of the page and click Save.

Restart your Minecraft server.

How I Backdoored a Minecraft Server...

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Darya Sannikova, Athena, Skylar Kang, Eren Li

How to Prevent Access to Minecraft Server from non-minecraft Clients?

Pictures about "How to Prevent Access to Minecraft Server from non-minecraft Clients?"

How do you let people crack your Minecraft server?

What Minecraft server allow cracked clients?

How I Backdoored a Minecraft Server...

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