A 404 error showed that a requested webpage was not available. Possible causes included incorrect URLs, broken links, or page movement. Fixing these errors was ...

How system administrators can troubleshoot an HTTP error 404 - File not found error message on a server that is running IIS This article helps you resolve the problem ...

These pages pretend to be HTTP errors such as 404 Not Found or Forbidden, while in reality they are login pages that allow an attacker to access a web shell to issue commands on the server.