WCF REST Service Hosting Error : HTTP Error 500.21 - Internal Server Error

HTTP Error 500.21 - Internal Server Error
Handler "svc-Integrated" has a bad module "ManagedPipelineHandler" in its module list in IIS 7.5


Solution:

If you see this error you haven't installed the prerequisites for ASP.NET 4.

Try this:

Step 1. Open Visual Studio Command Prompt
Step 2. Type the following: aspnet_regiis.exe -i
Step 3. Run the command

Try your service again... it should be working :-)

This command basically installs the necessary ASP pieces to get your service up and working!