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This Microsoft KB has some info about DNS in Win2008, including how to add forwarders. If you don't have a forwarder specified, than your DNS will contact the root servers for name resolution. You should set your forwarder to your ISP's DNS server, though you can also set to other public DNS servers if your ISP isn't reliable. It isn't usually helpful to help The clients should only be using the secondary DNS server if the first server is unavailable,i.e. it fails to respond to a query. So you may be having some other problem with your DNS server. Using the nslookup command from the command line can help find problems. When you have problems run it on both the dns server and on the client workstation. You should get the same results on both. It will tell you want server you are using by default and whether you connected successfully to it. You can then do lookups from the command line. You can also change the dns server you are checking against.