Now you've probably heard this alot, but I looked everywhere andnone fixed the problem. Whenever I try to join a server (And I am typing in the correct IP address) It always says Bad Login. I've tried this with multiple servers, so I know the problem isn't the server it's my computer.
So, do you know how to fix this?
(P.S. I've also heard of Hamachi. What is it and do I need it)