Hello, me again.

So when I tried to join the server a day or so ago, it wouldn't work because the "authentication servers are down for maintenance". So I tried a little later and it said "Invalid Session. Try restarting your game and the launcher.". So I did so, and then it came up saying "Connection Refused: no further information". I thought that was strange seeing as others don't seem to have a problem joining and there's nothing wrong with the connection on my end. Can anybody tell me what's going on?