When visitors coming to a site request pages that the web server cannot
find, the web server generates and displays a standard HTML page with an
error message. You may want to create your own error pages and use them
for your sites or individual virtual directories. The following error
messages are the ones customized most often:
- 400 Bad File Request. Usually means the syntax used in the URL is
incorrect (for example, uppercase letter should be lowercase letter;
wrong punctuation marks). - 401 Unauthorized. Server is looking for some encryption key from the
client and is not getting it. Also, wrong password may have been
entered. - 403 Forbidden/Access denied. Similar to 401; a special permission is
needed to access the site – a password or username, if it is a
registration issue. - 404 Not Found. Server cannot find the requested file. File has either
been moved or deleted, or the wrong URL or document name was entered.
This is the most common error. - 500 external Server Error. Could not retrieve the HTML document
because of server configuration problems. - 503 Service Temporarily Unavailable. The site is temporarily
unavailable due to maintenance.
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