[FYI] The HTTP status codes in IIS 7.0

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INTRODUCTION

When you try to access content on a server that is running Internet Information Services (IIS) 7.0 by using HTTP, IIS 7.0 returns a numeric code that indicates the status of the response. The HTTP status code is recorded in the IIS log. Additionally, the HTTP status code may be displayed in the client browser.
The HTTP status code may indicate whether a request is successful or unsuccessful. The HTTP status code may also reveal the exact reason that a request is unsuccessful.

more information:

https://support.microsoft.com/default.aspx?scid=kb;EN-US;943891