so i must have my computer on for use this proxy? also what are the nintendo's servers?http://www.charlesproxy.com/download/
(If you're going to try this, the default port for Charles is 8888, just to let you know before you set it up.)
Basically, all you have to do is set up the proxy with the Wii U, and then enable SSL for all of Nintendo's update servers. For some reason, it makes the connection to the servers fail.