Not getting ads with www dot domain

In the last week or so I haven't been getting ads on my main page. I just noticed that if I put www. domain.com I don't get ads, and if I do not use www. I get ads. Wtf?

 

I am kinda confused here but it could be your browser ... I was having a problem viewing ads with my main browser which is bon echo (firefox devel code) so I loaded my site in IE and it worked fine.

 

Firefox, but the same thing happens with IE.

 

My best guess would be that Google sees them as 2 different sites. if you're not getting ads on www.domain.com it may mean that Adsense has not yet indexed this site in its database and doesn't know what ads to show for it. Your best bet would probably be to choose one format (either www.domain.com or just domain.com) and stick with it. You can force your users to a specific format by modifying your .htaccess file. If you want all your users who type in www to be forwarded to just domain.com you can add this...

RewriteEngine on
RewriteCond %{HTTP_HOST} ^www\.example\.com$ [NC]
RewriteRule ^(.*)$ http://example.com/$1 [R=301,L]

Code (markup):

or if you want all your users who type in domain.com to be forwarded to www.domain.com you can type in this...

RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\.example\.com$ [NC]
RewriteRule ^(.*)$ http://www.example.com/$1 [R=301,L]

Code (markup):