does it eventally error? or do u manually have to close it?
if so does it give a cant connect to auth or perhaps a korean looking gibberish error box?
to answer this i would say i for one need more specifics.
what client version.
any error screen if possable.
what server pack?
if i had to guess id say its an opt problem.
but like i said id need more specifics before i could give a definitive answer