When visitors coming to your site request pages that the web server cannot find, the web server generates and displays a standard HTML page with an error message. The standard error messages may inform of problems, but they do not usually say how to resolve them or how to get the lost visitor on his way, and they also look dull.
You may want to create your own error pages and use them on your web server. With Plesk you can customize the following error messages:
- 400 Bad File Request. Usually means the syntax used in the URL is incorrect (e.g., uppercase letter should be lowercase letter; wrong punctuation marks).
- 401 Unauthorized. The server is looking for some encryption key from the client and is not getting it. Also, the wrong password may have been entered.
- 403 Forbidden/Access denied. Similar to 401; a special permission is needed to access the site? a password and/or username if it is a registration issue.
- 404 Not Found. The server cannot find the requested file. The file has either been moved or deleted, or the wrong URL or document name was entered. This is the most common error.
- 500 Internal Server Error. Could not retrieve the HTML document because of server-configuration problems.