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The solution you have given to me is not useful.i have been facing this problem from some time. Some of my pc login without dns entry. 
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Just because some computers do log on without the DNS entry doesn't mean that you are doing it right.<br />
You are doing it wrong and anyone who knows anything about Windows networking will tell you the same thing.<br />
Each PC MUST be configured with an IP address of the domain controller as the DNS server entry.<br />
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So you are suggesting Active Directory does not require DNS? &nbsp;<br />
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If you READ about Active Directory, you will see it is REQUIRED. &nbsp;Not having it setup properly can cause delays in accessing network resources or an inability to access resources. &nbsp;People have misconfigured DNS all the time... and when they do, they have these problems. &nbsp;And not just client DNS settings - your servers must also be setup properly.
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Mods, I dont think that any further zones will help this user get teh result they are looking for.... From above.....<br />
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&quot;Each PC MUST be configured with an IP address of the domain controller as the DNS server entry.&quot;<br />
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&quot;If you READ about Active Directory, you will see it is REQUIRED&quot;<br />
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Pretty much sums it up. When they hard coded the DNS server as the primary DNS, it fixed the problem, and set it how it is SUPPOSED to be. <br />
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I bhonestly think there is no further action here that we can take..... <br />
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All the expert asnwers haven't provied the correct solution...please close this question.<br />
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Thanks
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when i logon on domain it takes lot of time (2-5 hour).when i enter the dns entry in client side it logon immediately.<br />
My problem is that in past client pc was logon without dns entry but now i have to make an dns entry in every client pc for logon.
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when i logon on domain it takes lot of time (2-5 hour).when i enter the dns entry in client side it logon immediately.
My problem is that in past client pc was logon without dns entry but now i have to make an dns entry in every client pc for logon.

domain problem

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.

Microsoft Legacy OS

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.

Active Directory

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).