If you are seeing Minecraft Connection lost, Failed to Login Bad Login in Tekkit, then here are the solutions that have helped many fix the issue.

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.

After weeks of testing and refinement, Mojang Studios is finally releasing the 1.18.2 patch update for Minecraft: Java Edition, which includes dozens of fixes and technical updates.