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HTTP Error 404.3 – Not Found when attempting to browse the SmartConnect WCF web service.

Published: Oct 09, 2017
Post Author Written by David Youngquist

When attempting to browse the SmartConnect WCF web service, the browser window reports an error that says “HTTP Error 404.3 – Not Found” followed by an additional message that says “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 is causing this?


This means you do not have the ASP.NET components installed on your IIS server.  

1.  Go to Start – Administrative Tools – Server Manager
2.  Click on “Add roles and features”
3.  Click on Features
4.  Expand the .NET Framework 3.5 Features and .NET Framework 4.5 Features.  At the very minimum mark all the components shown in the screenshot below.  

5.  After installing the features restart the SmartConnect WCF service by going into IIS Manager highlighting the service and pressing the restart button on the right.

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