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.

[14:46:18] [Server thread/INFO]: CaoshB lost connection: Internal Exception: java.io.IOException: Connection reset by peer Not ure if this is bungee or spigot issue ?

[FIXED] Internal Exception: java.io.IOException: An existing connection was forcibly closed by the remote host. #1753 New issue Closed ...

Java exception handling with stack traces, exception chaining, try-with-resources, final re-throw, and StackWalker.