IIS7.5: Setup Integrated Windows Authentication like in IIS6 with a domain

Question

I have a simple website that has lived very happily on IIS6 using Integrated Windows Authentication using a domain. I'm trying to move it to II7.5.

The Issue:

When browsing to the site it get an authentication pop up. The local accounts work but not the domain accounts.

What I have done so far:

Disabled "Anonymous Authentication" Enabled "Windows Authentication"

Followed this doc.

http://www.iis.net/ConfigReference/system.webServer/security/authentication/windowsAuthentication

I can see all the authentication attempts in the event viewer.

What am I missing?