I just got a Wii U and it seems it must not like my router (a Linksys E3000). No other devices seem to have a problem. When I enter the settings in the system menu the connection to the router completes successfully but the connection to the Internet does not.
I've tried with DHCP as well as with a manually-specified IP and DNS. The error displayed is either 103-2101 (with DHCP) or 103-2001 (without). I don't know what to try next. Help?