A 403 Forbidden is an HTTP status code returned by a web server when a user requests a resource and the server rejects the request. In other words, the server can be reached, but the server declined to allow access to the page. The message that most browsers display is misleading. Most people think its related to user access, but there are quite a few causes. In Microsoft IIS its common to see this response when directory listings are denied. Lets look at how to start troubleshooting 403 response codes.