Can't log onto ANY chars from my acc :(

As the title says, I can not log onto ANY chars from my acc. When i actually log on, i will d/c and says that Maplestory cannot connect to the login sever... Blah blah blah and you know the rest. This oddly enogh only happens to my acc but not my friend's account. My account coincidently contains a 200 Shadower, 73 Sader and a 79 Dexless hermit. No matter what i do, I can't go in and train any chars.... Please help.....

Account name, and chars name, all of them