Publishig a new project created with Visual Studio 2013 Update 3 and ASP.NET MVC4 on IIS 8.5 and Windows Server 2012 R2 only resulted in Error 403.14.
Since it was the first MVC project on that server I thought is was a configuration issue in IIS. After testing almost all suggestions found on Internet (most of the referring to IIS 7.5), I found someone with that same problem and had a solution.
The problem was the setting “Precompile during publish” when publishing. I publish to a local folder before sending it to the server and I’d selected that because I thought it would make the site faster. But this completely broke the site!
Disabling “Precompile during publish”, republishing it (locally) and sending it to the server and now it worked as expected!