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.
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 220.127.116.11
Where 18.104.22.168 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.
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 SureSupport.com if you need information from the error_log of the web server.