not sure why that happens, maybe there was lots of traffic when you tried or something, dont think they would completely cut off japan.. i think some places give limited amount of bandwidth to be used for different countries, depending on the amount of users that come there and where thay're from.. maybe try again later..
while you're waiting..
this place has a buttload of samples too:
http://www.darkbeats.com/sampleswap/
also:
http://www.dnbwiki.com/index.php/Free_Samples
however, alot of the links at the dnbwiki page just leads to the filefront site, but there should be other stuff too, samples hosted at other places..