AX2012 Help server error - Handler "svc-Integrated" has a bad module "ManagedPipelineHandler" in its module list

When you open the Help menu, it displays an error dialog saying "Unable to contact the server".

When opening the help server URL using an internet browser, it displays an error saying "Handler "svc-Integrated" has a bad module "ManagedPipelineHandler" in its module list".

Solution:

Open a command prompt and run this:

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