Friday, February 14, 2014

Windows XP to Windows 7 Migration and NetBIOS Name Resolution Issue (DNS Devolution)

I know this title is little confusing. We ran into this issue after upgrading workstations from Winnows XP to Windows 7.  All these computers were part of an Active Directory domain called  From Windows 7 machines, access to resources in the parent namespace ( was failing when you use a NetBIOS name. You have to use a Fully Qualified Domain Name (FQDN) from Windows 7 machines to access these resources. 

Following is a screenshot from a Windows XP machine.  As you can see, these machines were getting local domain ( and parent domain suffix ( 


So these computers that are members of a child namespace ( can access resources in the parent namespace ( without the need to explicitly provide the fully qualified domain name (FQDN) of the resource.  As you can see in the below screenshot, Windows 7 machine has only one entry in the DNS Suffix Search List -  So access to resources in the parent namespace ( was failing.


The new change in the DNS (DNS Devolution) cause this issue.  Even if you select Append parent suffixes of the primary DNS suffix  (as shown in the below screenshot), Windows 7 machines were not getting parent namespace ( because of the default DNS Devolution settings. 


If you are not planning to use DNS Suffix Search List, your option is to change the default DNS Devolution level using a GPO or registry settings.  You can read more information here -

In my scenario, I have to use DNS Devolution Level 2 to get both and on the DNS Suffix Search List.  I have used the following 3 settings in the GPO to resolve this issue.

Computer Configuration\Administrative Templates\Network\DNS Client




Thanks Santhosh. Worked for me

Perfect!. Thanks for the feedback!

Windows 7 is a much more advanced operating system than Windows XP. There are a bunch of new features in it and quite helpful for office work and education. However, students were using assignment writing services but now with this new addition of Windows, students are able to write their projects by themselves as these new features provide a way better working experience.

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