Nintendo's error codes are ambiguous and sometimes misleading. 002-123 is listed as a connection issue but it also happens if your header/chip ID don't match. 002-0102 is listed as a connection error too but as we've seen it can also be a ban. The best bet is to check if the error happens in the friends list.Probably it was a connection issue. Can't check it now since the error's gone. The numbers might have been 002-0123, I can't remember exactly. Never mind.