How to create pages for "Page Not Found" and "Access Denied"?

Just go to "Create content" and select "Page." I title them "Access Denied" and "Page Not
Found" but you can call them whatever makes sense to you and your users. When you
submit them, note the node ids. Then go to Administer >> Site Configuration >> Error Reporting  and
enter "node/__" in the appropriate boxes.

Suppose for Access Denied page node id is 8 and I give content as follows:

<p>We're sorry, but you must have permission to view the page you requested.</p>
<p>&nbsp;</p>
<p>If you are already a registered member of this site, please try <a href="user">logging in</a>.</p>
<p>&nbsp;</p>
<p>If you are not a member, you need to <a href="/join_us">join us</a>.</p>
<p>&nbsp;</p>
<p>If you have any questions about our site or group, please feel free to <a href="/contact">contact us</a>.</p>
<p>&nbsp;</p>
<p>--Webmistress</p>


And for Page Not Found page node id is 9 and I give content as follows:

<p>Sorry! The page you were looking for no longer exists. We redesigned our site and many of the pages have
changed.</p>
<p>&nbsp;</p>
<p>If you are unable to find something on our new site or have a question about our site or services feel free to
<a href="/contact">contact us</a>.</p>
<p>&nbsp;</p>
<p>--Webmistress</p>

Now go to Administer >> Site Configuration >> Error Reporting
Here, assign your content node id and Save Configuration.


So, we will give node/8 for Access denied and node/9 for Page Not Found.


Also, you can create page for both :

Page Not Found: page-node-8.tpl.php

Access Denied: page-node-9.tpl.php

Enjoy Drupaling !

Cheers!