Well, this is what Nintendo says about the error code:
http://www.nintendo.com/consumer/wfc/en_na/ds/results.jsp?error_code=20115&system=Wii&locale=en_US&action2.x=31&action2.y=22
Quote:There could be a temporary issue with the Nintendo Wi-Fi Connection servers. Please wait a few hours and try again.
http://www.nintendo.com/consumer/wfc/en_na/ds/results.jsp?error_code=20115&system=Wii&locale=en_US&action2.x=31&action2.y=22
