Let say you implement your projects using with .NET 2.0 and you decided to upgrade .NET version from 2.0 to 4.0. May be you construct new server environment to configure server’s features such as IIS, Application server, Failover cluster etc.
You probably come face to face following error:
HTTP Error 500.21 – Internal Server Error- Handler “WebServiceHandlerFactory-Integrated” has a bad module “ManagedPipelineHandler” in its module list.
We need to register .NET 4.0 to IIS in order to do that open a command prompt and run the following command: