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.

Having trouble with this error in Minecraft? Here are ways to fix it.

If you encounter a missing profile public key error, you may want to close down your game and launcher and run it again in vanilla before re-connecting to a server.

Make sure your JAVA client matches your operating system (32 or 64bit) and re-install respective version of JAVA client. 2# Minecraft – Low Performance, Low FPS, Frame Drops Mod your game with ...

If you see Failed to connect to the server, Connection timed out no further information error on Minecraft, this guide has working solutions to fix it.

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.

There are several causes that can cause this particular problem ranging from the third party antivirus programs installed on your computer, firewall port issues or server connection problem. But ...