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I have a joomla website installed and working good. i installed Qlue404 component which redirects 404 page to a custom page., sometimes when i try the symbols ' and some others the 404 page appears with the message "Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request." also it shows the server information *Apache mod_fcgid/2.3.6 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/ Server at mywebsite.com Port 80*

how can i disable this message? i swear this leads to get all information for a hacker to do an Sql Injection.

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It does not allow "to get all information for a hacker to do an Sql Injection." – John Conde Oct 11 '11 at 15:33

From Apache's docs:

Use of ErrorDocument is enabled for .htaccess files when the AllowOverride is set accordingly.

Here are some examples...

ErrorDocument 500 /cgi-bin/crash-recover
ErrorDocument 500 "Sorry, our script crashed. Oh dear"
ErrorDocument 500 http://xxx/

ErrorDocument 404 /Lame_excuses/not_found.html
ErrorDocument 401 /Subscription/how_to_subscribe.html

The syntax is,

ErrorDocument <3-digit-code> where the action can be,

  • Text to be displayed. Prefix the text with a quote ("). Whatever follows the quote is displayed. Note: the (") prefix isn't displayed.

  • An external URL to redirect to.

  • A local URL to redirect to.

Basically what you want to do is place this snippet in a .htaccess file in your root web directory to contain this (obviously you will want to change the URL to one you prefer):

ErrorDocument 404 /my-custom-404-page.html 
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