let's try to go over few things before we proceed
- did you add "monoxtesting.local" binding in the host file in Windows folder in order to resolve this domain to proper IP addess ?
- it seems to me that you didn't register ASP.NET with IIS, there is a package in the Web Platform Installer called "Execute ASP.NET IIS Registration Tool" which will register ASP.NET in the IIS so please make sure that you have installed this package before we continue.
- can you please send us an error log from WPI installation so we can check what is the issue ? (Note: WPI has an older version of MonoX as we are in the process of publishing new one)