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http://www.nintendo.com/consumer/wfc/en_na/ds/results.jsp?error_code=103-2001&system=Wiiu&locale=lang
http://www.nintendo.com/consumer/systems/wiiu/en_na/internet_connect_online.jsp?menu=how_to&submenu=wup-online-ht-dns-settings

Maybe entering in the DNS manually helps?