I'm running my WPMS site on an EC2 instance as shown here:
live.site.com -> CNAME to -> internal.domain.com -> CNAME to -> ec2.domain.com
If a user or search engine accesses "internal.domain.com" they are redirected to "live.site.com/wp-signup.php?new=internal.domain.com" but ideally they'd be routed to live.site.com.
I'd like to hide internal.domain.com if at all possible, and setup robots.txt for the domain to block search engines. How can I do that?