I was knocked out from game, when I tried to re-connect it, the client told me my password or account is not incorrect?
Therefore, I tired to log into LOL official website, and same account with same password. I can enter here. What's wrong ?
Close the client completely and relaunch. If it doesn't work, restart the computer. Still doesn't work, you can try downloading CCleaner and use it to clear some cache build up (restarting computer should already do that, but you never know), which I suspect may be where the problem is though I am no technical expert on this so don't quote me.
