“Network protocol error” often happens when the version of Minecraft you’re using isn’t matching up with the version the server is running. It might also show up if the server or your connection has issues—like an incorrect IP address, firewall settings blocking your connection, or even a plugin error. Here are a few things you can try:
• Double-check that your Minecraft client has the exact same version as your server. Example: the server is on 1.20, for example, make sure you’re launching Minecraft 1.20.
• Confirm you’re using the right IP and port.
• Make sure your server plugins or mods are updated and support the game version you want to play on.
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