To fix Internal Exception: java.io.IOException, An existing connection was forcibly closed by the remote host Minecraft error, you need to follow the given solutions.

The Internal Exception Java.IO.IOException error usually occurs when you launch Minecraft, or when the game is underway. This error can be caused by a number of different things.

Java’s compile-time checking does a pretty good job of keeping exceptions safely caged—you can’t call a method that throws a checked exception without catching the exception or declaring ...