Problem in www

[erfan]

I have a problem
sometimes sites with addresses which start with "www" contain different contents from the sites with the same addresses whithout "www" ... How can I fix this problem?
"IP has changed a month ago. So this problem is not for ISP Cache


For example:
http://www.example.com
http://example.com

Please help me.

 

[NoBaloney2]

Check to make sure both www.example.com and example.com have the same IP#. Check your site-specific httpd.conf files to make sure both point to the same folder.

Jeff