HTTP Error 404.3 - Not found - The page you are requesting cannot be served because of the extension configuration
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.
what could be the reason of this error for the WCF service hosted on IIS 7.
Please make sure you've activated WCF components from here.
Or alternate and easy way is, go to control panel -> Turn Windows feature on or off -> and make sure you've all the options ticked as mentioned in below screenshot.
Run from cmd:
All you need to do is enable HTTP Activation and any other features that are required for HTTP activation.
For Windows Server 2012,Go to server manager, on the dashboard --> click on Add roles and features. In the Wizard window that opens choose the appropriate server and go on clicking next until you are on the features selection page.
Depending on the version of .NET framework in use on your server you have to check HTTP Activation under WCF Services and proceed to install it. This should resolve your issue.
Run Visual Studio 2008 Command Prompt as “Administrator”. Navigate to C:\Windows\Microsoft.NET\Framework\v3.0\Windows Communication Foundation. Run this command servicemodelreg –i
Thanks for the blog from Rahul.