Run Minecraft. Select Multiplayer. Click Options. Go to Problematic Server and click Edit. Select Server Resource Packs and hit Disable it. Restart the game and see if the issue has been resolved ...

Minecraft Internal Exception errors can be frustrating to get rid of if you do not know what to do.

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.