In this guide, we’ll show you the tips that you can try to fix this problem. How to fix Minecraft Internal Exception Java.IO.IOException error?

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.

Enable Java Native Sandbox Enabling the Java Native Sandbox option has helped some users clear up their issues related to io.netty.handler and Java.IO.IOException.