After installing Security Update 2007-005 (v1.0), the Mac OS X Server 10.4 DNS service may not start automatically when the server starts up.
As a workaround, start the DNS Service in Server Admin. You should only need to do this once--it will continue to use your previous DNS configuration and will start automatically after future restarts.
This issue does not occur with Security Update 2007-005 (v1.1) for Mac OS X Server 10.4.9.