ColtonUpDaBlock

Hello, I'm a new player having trouble getting in to a server I was playing on earlier. The server I was playing on was down for maintenance so I joined another just to check it out. I go back to the server I first played on and get error 0x00040046 already connected to another server. I saw a way to fix it was to find the theblast server played but I can't find it. I don't know what it was. And now I can't get in to any server. Any solution will be greatly appreciated.