awtx

This is not a DNS issue. ModSecurity is blocking your IP address. There have been many of the exact same GoDaddy complaints after their update on July 1.

We are still waiting for GoDaddy to whitelist our office static IP address so we can work on our sites.

http://wordpress.org/support/topic/cant-post-after-352-upgrade-modsecurity-problem

Saw this a little late.
You can always review your raw website logs to see which IP addresses accessed /wp-admin/

Whether it is for the primary domains or additional network sites, you are parking additional domains on the primary domain.

If you want the additional domain(s) to deliver the visitor to the primary site there would be no need to try to map the domains. The browser would be automatically redirected to the primary site if the parked domains are not mapped to network sites.