go into the browser on the WiiU and go in to settings and turn on developer mode. you can see the WiiU ip after you do that. then make sure pygecko is enabled and then launch your game. and then once loaded go to gecko dnet pc client and enter the IP you saw in the browser. click connect it should give an error just click continue its normal.
if it won't connect try:
1.)disable anti virus protection
2.)disable firewall
3.) Make sure the wiiU didn't freeze from trying to connect.