Q:

HTTP Error 404.3-Not Found in IIS 10

I use IIS version 10 and Windows 10 and VisualStudio 2015. 
After I add WEB application  to IIS site and open it I get error:
HTTP Error 404.3 - Not Found

The page you are requesting cannot be served because of the extension configuration. If the page is a script, add a handler. If the file should be downloaded, add a MIME map.

I installed IIS sub components from:
Control Panel -> Programs and Features -> Turn Windows features on or off

As described in this post by Mekanik.
Here is screenshot of installed sub components:

But it didn't helped me and still I get the same error.
Any Idea why I keep getting this error above maybe it has something to do with version of IIS 10?

A:

I had the same problem for a WCF web service.
Fixed it as follows:
Open - Turn Windows Features ON or OFF, then 
Enable HTTP Activation

