If you have a fresh install of .NET on your machine and you can't get your app working - eg. umbraco 4.6+ project - this may indicate that .NET 4.0 isn't register with your IIS 7 yet.

First thing to check is whether .NET v4.0 appears under ISAPI and CGI Restrictions in your IIS console. 


If you can't see .NET listed (see above) you need to run following command in cmd:

C:\Windows\Microsoft.NET\Framework64\v4.0.30319\aspnet_regiis.exe -ir

Once you've done that, all you have to do is enable ASP.NET v4.0xx in ISAPI and CGI Restrictions.

Tagged: .NET 3.5  .NET 4  IIS  IIS 7  internet information services  umbraco 4.7.x  windows development