.net 4.0 - IIS Managed Module in .NET4 -

I want to write a managed module to use .NET 4.0 for IIS 7.5 because I have a new memory map file Class .
I started a small prototype, which compiled with .NET 4.0 and successfully tried to integrate it into IIS.
Module is a strong name and I can install it in GAC. After that I added this through the IIS Manager but the worker process does not load it because I can not debug the debugger by adding w3wp.exe to the debugger. AppPool also runs with .net 4.0.
Any ideas about this? Thank you, Simon

I solved it. I had to uncheck "invite only for requests from ASP.NET applications or managed operators" checkbox. After this the module works as expected.