Online Manual » Server/System Specifications » Apache error codes (401, 403, 404, 412, 500)

Apache error codes (401, 403, 404, 412, 500)

The meanings of these error codes from the web server are:

  • 401 Authorization Required

    This means that the page requires that the visitors authenticate with their username and password. If they fail to do that, the server returns this error message.

  • 403 Forbidden

    This means that access to the page the visitor is requesting is not allowed. This can be due to a special rule in the configuration of the web server, or to the specific file system permissions of the file.

    An example rule in .htaccess that would cause this message is this:

    deny from

    Where is the IP address of the visitor.

    This error can also be caused by the file lacking read permissions. In that case, the web server will not be able to read the file, and this error message would be displayed.

  • 404 Not Found

    This simply means that the requested file is not there.

  • 412 Precondition Failed

    The error means that the request triggered a mod_security protection on our end. You can learn more on this matter at

  • 500 Internal Server Error

    This can be the most confusing error message, because it can be caused by many things ranging from server problems and permission problems to application errors and misconfigurations. Information about the actual error message is recorded in the server's error_log. Please contact our Support team at if you need information from the error_log of the web server.