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.

Reinstalled Minecraft and Java thrice. Restarted my router and played around with the firewall (my router is AT&T btw if that helps). Tried installing Netty, but, every time I do it breaks chrome.

Type: SupportIssues that look for answers. Not an actual issue.Issues that look for answers. Not an actual issue. Hello. Me and my wife have a problem with minecraft 1.12.2 forge server with mods. We ...