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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 
(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 and/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.

> 405 Method Not Allowed. The method specified in the Request-Line is not 
allowed for the resource identified by the Request-URI.

> 406 Not Acceptable. The resource identified by the request is only capable of 
generating response entities which have content characteristics not acceptable 
according to the accept headers sent in the request.

> 407 Proxy Authentication Required. This code is similar to 401 (Unauthorized), 
but indicates that the client must first authenticate itself with the proxy.

> 412 Precondition Failed. The precondition given in one or more of the request-
header fields evaluated to false when it was tested on the server. This response 
code allows the client to place preconditions on the current resource 
metainformation (header field data) and thus prevent the requested method from 
being applied to a resource other than the one intended.

> 414 Request-URI Too Long. The server is refusing to service the request 
because the Request-URI is longer than the server is willing to interpret. This rare 
condition is only likely to occur when a client has improperly converted a POST 
request to a GET request with long query information, when the client has 
descended into a URI "black hole" of redirection (e.g., a redirected URI prefix that 
points to a suffix of itself), or when the server is under attack by a client attempting 
to exploit security holes present in some servers using fixed-length buffers for 
reading or manipulating the Request-URI.

> 415 Unsupported Media Type. The server is refusing to service the request 
because the entity of the request is in a format not supported by the requested 
resource for the requested method.

> 500 Internal Server Error. Could not retrieve the HTML document because of 
server-configuration problems.

> 501 Not Implemented. The server does not support the functionality required to 
fulfill the request. This is the appropriate response when the server does not 
recognize the request method and is not capable of supporting it for any resource.

> 502 Bad Gateway. The server, while acting as a gateway or proxy, received an 
invalid response from the upstream server it accessed in attempting to fulfill the 
request.

To configure Plesk's web server to show your custom error pages:

1 Switch on support for custom error documents through Plesk. On your Home 
page, click the domain name you need, and then click Setup. Select the Custom 
Error Documents check box. Click OK.

2 Connect to your FTP account on the Plesk server, and go to the error_docs 
directory.

3 Edit or replace the respective files. Be sure to preserve the correct file names:
> 400 Bad File Request - bad_request.html
> 401 Unauthorized - unauthorized.html
> 403 Forbidden/Access denied - forbidden.html
> 404 Not Found - not_found.html
> 405 Method Not Allowed - method_not_allowed.html
> 406 Not Acceptable - not_acceptable.html
> 407 Proxy Authentication Required - proxy_authentication_required.html
> 412 Precondition Failed - precondition_failed.html
> 414 Request-URI Too Long - request-uri_too_long.html
> 415 Unsupported Media Type - unsupported_media_type.html
> 500 Internal Server Error - internal_server_error.html
> 501 Not Implemented - not_implemented.html
> 502 Bad Gateway - bad_gateway.html

4 Contact support, and request a restart of Apache. After that, the Web server 
will start using your error documents.