The symptom I was getting on the SBS2K3 server was that the DNS was not dynamically being updated with A and PTR records despite the setting in DHCP saying it would. At the workstation I would get a daily error in system events about being unable to update the host information in the DNS. Otherwise, this error was transparent to me. I finally traced this error back to an improper setting in the network identification at the workstation. It had the correct host name but it did not show the full network name which includes the primary domain suffix. To add the primary domain suffix, go to Control Panel-System Properties-Computer Name. Click on the button to change the computer name and then click on the “More” button on the next screen. The next screen will allow you to change the primary domain suffix. In my case I needed to add the primary domain suffix. After clicking Ok and rebooting, the A and PTR records appeared correctly in the DNS.