Mapping a subdomain

I am attempting to map a subdomain url to a blog on my wpmu site.

Example: should point to

I've added a cname record to domain1 for to
I've also tried adding an A record pointing the the IP address of the server.

With the A record in place I pinged both and and received the IP address for the server for both replies.

When I enter in a browser I receive the Apache startup page.

Any ideas?