First of all, such configuration of site is not good for SEO. You should redirect non-www version to www version or vice versa. Use this lines in your .htaccess file
Code:
RewriteEngine On
RewriteCond %{HTTP_HOST} ^domain\.com
RewriteRule ^(.*)$ http://www.domain.com/$1 [R=permanent,L]
In above case, in VM configuration > Security, you should enter link with www.
