Why does the 404 Not Found page appear when I access a resource?


When the web server returns an HTTP 404 status code, the web page is automatically redirected to the 404 Not Found page. A URL cannot be accessed if the URL generation rules of the web page have changed, the web file is renamed or relocated, or a spelling error exists in the provided URL. When the web server receives a request for such a URL, it returns a 404 status code to notify the browser that the requested resource does not exist. Possible causes of a 404 error:
  • The website cannot be accessed through the requested port.
  • The web service extension lockdown policy blocks this request.
  • The MIME map policy blocks this request.
Note When only one resource is requested and the resource is not found on the origin server, a 404 status code is returned and a 404 error page is displayed. When multiple resources are requested and only some of the resources are not found on the origin server, the 404 error page is not displayed.