Setup Win2k8Server1 is DNS server Win7Client has Win2k8Server1 as its DNS server Remote host has a domain a.com, which has two CNAME records: mail.a.com which points to mail.a.net citrix.a.com which points to citrix.a.net From win7client, mail.a.com resolves just fine, however citrix.a.com comes up as non-existent domain NSlookup to any other external DNS servers (like 8.8.8.8) works fine. If I setup forwarders on Win2k8 server to 8.8.8.8 the clients resolve fine. Any ideas as to why one record in the zone a.com resolve correctly however another record in the same zone configured identically come up as non-existant domain? Thanks -Shah

Hello, Please make sure that you have an A record named citrix in the a.net zone with the correct IP address. Also, please make sure that your client computer is poiting to your internal DNS server as primary DNS server. This posting is provided "AS IS" with no warranties or guarantees , and confers no rights. Microsoft Student Partner 2010 / 2011 Microsoft Certified Professional Microsoft Certified Systems Administrator: Security Microsoft Certified Systems Engineer: Security Microsoft Certified Technology Specialist: Windows Server 2008 Active Directory, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Network Infrastructure, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Applications Infrastructure, Configuration Microsoft Certified Technology Specialist: Windows 7, Configuring Microsoft Certified IT Professional: Enterprise Administrator Microsoft Certified IT Professional: Server Administrator

Thanks for the reply, but yes, the records are verified. If you do nslookup with 8.8.8.8 (google's DNS servers), the records are resolved correctly. It is just windows clients/server which are unable to resolve the records from the Nameservers of the domain. However, one cname record is being resolved, another one isn't, and its configured identically on the server. Thanks Shah

Hi Shah, Thanks for posting here. So are both zones hosted on same DNS server ? or perhaps you have set replication for zone a.net between few servers ? And what if directly perform same querying command on that DNS server , will it work properly ? You might need clean local DNS cache on client first and try again to see how is going . Regards, Tiger Li TechNet Subscriber Support in forum If you have any feedback on our support, please contact tnmff@microsoft.com. Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Tiger, Thanks for your response. No, both zones are hosted on separate DNS servers. Same query command on the nameserver of the zone fails from a windows client. But if you specify another server: nslookup server 8.8.8.8 set type=A citrix.a.com - this works fine however if you do: nslookup server ns1.a.com set type=A citrix.a.com - this fails with non existent domain however mail.a.com works just fine! So another server like google's dns server is able to read the citrix.a.com entry however windows dns server/client are not able to. Any ideas? -Shah

Hi Shah, Thanks for posting here. If it works when specify to use other public DNS servers, I’d suspect some name resolution issues on your exist DNS servers might cause these . So was there any problem to directly resolve “mail.a.net” or “citrix.a.net” on both DNS server and client without DNS forwarder setting by using nslookup? and what are the DNS servers they pointing to use ? please post unedited “ipconfig /all” results from both server and client here for further investigation. You might also enable DNS debug logging in order to obtain the detail information on the querying process : Using server debug logging options http://technet.microsoft.com/en-us/library/cc776361(WS.10).aspx Regards, Tiger Li TechNet Subscriber Support in forum If you have any feedback on our support, please contact tnmff@microsoft.com. Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Hi Shah, If there is any update on this issue, please feel free to let us know. Regards, Tiger Li TechNet Subscriber Support in forum If you have any feedback on our support, please contact tnmff@microsoft.com.Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.