.net 4.0 appears not to be installed in the server manager > application server on win2008

on the 64 bit win 2008 serv开发者_开发问答er, .net 4.0 is not mentioned in the role services - just the 3.5.1 .net framework. Could this be why my MVC programs arent working on IIS 7.5 with the 404 /403 messages?

Server 2008 was released a long time before .NET 4, the core OS knows nothing of .NET 4 unless you explicitly install it. And it will still not be listed in Server Manager | Features.

Server 2008 will just list 3.0 (the current version of .NET when it was released, Server 2008 R2 lists 3.5.1 (as you mention IIS7.5 it seems you are actually using Server 2008 R2).

Once .NET 4 is installed you can create (or use) one of the .NET 4 application pools for your application.