404 ...means CyberSpark was able to connect to the server but the server reported that the URL does not exist.

If the URL corresponds to a file (javascript, CSS, etc.), then something is wrong and it has been removed from your server.

It could also be that the web server configuration has changed (including .htaccess files).

If the is “manufactured” by a content management system (like WordPress, for instance), then there could be a problem with the software or the database.

403 ...means the web server recognizes the URL but won’t permit you to retrieve anything using this URL. If you’ve previously been able to retrieve this page then a 403 means your web server configuration has changed—this is a serious problem you should investigate immediately.

401 ...means a name and password are required to access the page. You can put the name and password into the URL itself by adding it between the “http://” and the server name.

HTTP authentication: add the user name and password before the server name. For example: