Maybe because the server was DOWN ! Look on the site befor trying to go in game. I have the server on my own computer but I can't let it be on all days sometimes i will turn it off for the night but it is up EVERY day while I am in school and when i get home it WILL be down every night this week and on the weekends i have it up all days AND nights, I think i will try to buy a SERVER COMPUTER when i get MONEY. (you could donate some to get the server computer but i havent fixed the donate "button".