Can't access About.com from my Macbook pro 2011 (lion then mtn lion), no matter what I try
The new version of Mac OS X (Mountain Lion) has disabled the ability to use localhost. I was looking for the same thing—my development page wasn't working and I started to worry. Turns out its Apple's way to get you to pay another 19.99 for OS X server. Do a quick Google search, there are a few sites out there that explain how to force it back on, since Apache is still built in.