If You Receive "IIS HTTP Error 404.3 - Not Found"

If You Receive "IIS HTTP Error 404.3 - Not Found," with the message: "The page you are requesting cannot be served because of the extension configuration."

In Windows:

  1. Open up ‘Programs & Features’

  2. Select ‘Turn Windows features on or off’ (on the left, must be administrator)

  3. Make sure ‘.NET Framework 4.5 Advanced Services’ is selected.

    1. Navigate to ‘.NET Framework 4.5 Advanced Services’ > ‘WCF Services’ & make sure ‘HTTP Activation’ is selected.