In your httpd.conf file, look for an entry like this:
<VirtualHost bestbookbuys.com>
ServerAlias www.bestbookbuys.com
That's the problem in a nutshell: you are defining the "real" name of the Web site to be the domain name
without the www prefix. To fix it, change the above entry to something more like:
<VirtualHost www.bestbookbuys.com>
without any ServerAlias entry at all.
Failing that, if you have an entry in your httpd.conf that's more like this:
<VirtualHost www.auctionincome.com>
ServerAlias auctionincome.com
just remove the ServerAlias line.
Either way, you'll also want to, later in the httpd.conf file, add this:
<VirtualHost auctionincome.com>
Redirect permanent / http://www.auctionincome.com/
</VirtualHost>
This is explained in some detail in
the Apache documentation too, if you want more detail.
One cool additional feature: a Redirect of this nature copies everything after the first slash, so a URL like
auctionincome.com/abc/def.html will redirect to
www.auctionincome.com/abc/def.html, which is exactly what you want.
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mod_rewrite also does a good job, and avoids the extra vhosts. Here's what I use to map www.site -> site (this is for ccsacertification.com, substitute as appropriate)
RewriteEngine on
RewriteCond %{HTTP_HOST} !^ccsacertification\.com [NC]
RewriteCond %{HTTP_HOST} !^$
RewriteRule ^/(.*) http://ccsacertification.com/$1 [L,R]
Sean