Domain Not Resolving

I have a WP Multisite setup with subdomians with the Domain Mapping feature. I have a domain name that I changed the "A" record on to resolve to a member blog http://subdomain.domain.com/ the doamin name resolves to the IP address the member has put in the domain name in their domain manager. But the site does not resolved.

MY WP MS installation is on a cloud server with Softlayer.