Not sure if it an authentication error but I'm having trouble connecting to my wifi as well. When I had my Incredible I had to setup a static ip. I attempted to make a static ip for my Nexus but there were several fields I didn't know what needed to be filled out. I'm still searching and haven't found anything. I'm able to connect to my wifi but I can't use applications that use the Internet.
Not sure...
Proxy settings: None/Manual
Network prefix length: ?