MultiSite domain is not pointing to second page

I am sure I just missing a setting-- and I looked thru the Support posting but did not find my specific issue (or did not know how it was posted). Anyway I have databucket.com running. I have arisystems.databucket.com running. The A records for arisystems.com point to the IP for databucket.com I can see the home page of http://www.arisystems.com. But a the second page returns a Not Found, which I can assume is either permissions or a bad setting on my part. That said I am unable to find my error and I need direction.