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MCSE : Security Specialist DNS Configuration A DNS server that supports Active Directory DNS entries (SRV records) must be present for Active Directory to function properly. Read Create a New DNS Server for AD for more info. You need to keep in mind the following DNS configuration issues when you install Active Directory on a home network: Root Zone entries and DNS Forwarders. Root zone entries External DNS queries to the Internet do not work if a root zone entry exists on the DNS server. To resolve this issue, remove the root zone entry. This entry is identified with a dot (.) in the DNS Manager forward lookup zones. To check for the existence of the root zone entry, open the forward lookup zones in the DNS Management console. You should see the entry for the domain. If the "dot" zone exists, delete it. For additional information about the root zone entry. You can also read my No Forwarding or Root Hints on DNS server? tip. DNS forwarders (recommended) If you plan to have full Internet connectivity then DNS forwarders are necessary to ensure that all DNS entries are correctly sent to your Internet service provider's DNS server and that computers on your network will be able to resole Internet addresses correctly. You can only configure DNS forwarders if no root zone entry is present. To configure forwarders on the DNS server: Start the DNS Management console. Right-click the name of the server, and then click Properties. On the Forwarders tab, click to select the Enable Forwarders check box. Type the appropriate IP addresses for the DNS servers that may be accepting forwarded requests from this DNS server. The list reads top-down in order, so place a preferred DNS server at the top of the list. It is recommended that you have all the Root Hints (Top Level DNS server) listed in the Root Hints tab. If not, copy the Cache.dns file from the %systemroot%\system32\dns\samples folder to the %systemroot%\system32\dns\ folder and restart the DNS service. Click OK to accept the changes. You can also read Configure DNS Forwarding on Windows 2000.