404 page.

It depends on who your host is.

If you have access to your own .htacess file you can do it easily. Just create a HTML page, name it 404.html and upload it to your directory. Then edit your .htacess file to include the line

ErrorDocument 404 http://www.yourdomain.com/404.html

The same goes for other error docs too like:
ErrorDocument 401 http://www.yourdomain.com/401.html
ErrorDocument 403 http://www.yourdomain.com/403.html
ErrorDocument 500 http://www.yourdomain.com/500.html

However, before doing this make sure you have access to and are allowed to edit your .htacess file. Some hosts allow custom 404 pages, but THEY maintain control of that file and they make the edits to it, so you'd need to contact the host tech support for details. Other hosts (especially FWPs) don't allow any changes to your .htaccess file, so you're out of luck.

When in doubt, always contact your host before making changes to that file. If you do things wrong you can really cause some problems, so it's best to check 1st.

thank you!

i thought to do it already, but now - thanks to you - i decided to contact them...
bye bye...

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I bet you never been in this site before...
Deja~vu