This "Not Found" response code indicates that although the client could communicate to the server, the server could not find what was requested or it was configured not to fulfill the request. Before we proceed with troubleshooting, I need to as

Microsoft's IIS 7.0, IIS 7.5, and IIS 8.0 servers define the following HTTP substatus codes to indicate a more specific cause of a 404 error: 404.0 – Not found. 404.1 – Site Not Found. 404.2 – ISAPI or CGI restriction. 404.3 – MIME type restri

So it's possible for the actual requested URL to not have a resource. It is the server's duty to break down the URL from the template to look for the resource. If they resource doesn't exist, then it's "Not Found" Here's from