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Restrict subdomain access to addon domains

Summary

Each Addon Domain requires a subdomain. Using mod_rewrite you can stop people from being able to use the addon domain as a subdomain of the primary domain

Preventing use of the Subdomain

Put this in the .htaccess file located at the subdomains folder, changing the subdomain, primarydomain.com and addondomain.com: 

RewriteEngine On
            RewriteCond %{HTTP_HOST} ^subdomain.primarydomain.com$ [OR]
            RewriteCond %{HTTP_HOST} ^www.subdomain.primarydomain.com$ [OR]
            RewriteCond %{HTTP_HOST} ^addondomain.com$
            RewriteCond %{REQUEST_URI} ^/$
            RewriteRule ^(.*)$ http://www.addondomain.com/ [R=301,L]


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