Article ID: 199909
This article was previously published under Q199909
IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/256986/EN-US/ )Description of the Microsoft Windows Registry
After applying Service Pack 4 to a Windows NT 4.0 DNS Server, the server will appear to stop resolving queries for hosts in certain remote domains. The first query for a host in one of these domains will succeed, but subsequent queries for other hosts in the same domain will fail.
The DNS code in Service Pack 4 was updated to support Ranking Data as defined in RFC 2181 section 5.4.1. After an answer from an authoritative NS has been cached, Windows NT DNS discontinues querying referrals to non-authoritative NSs. The authoritative NS is cached. If the authority does not have an associated glue record for the additional NSs, DNS will not be able to resolve the HOST RR for the other NSs, thus causing subsequent queries to fail.
To work around this problem, do the following:
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the individual software update. For information on obtaining the latest service pack, please go to:
Microsoft has confirmed that this is a problem in Windows NT version 4.0 SP4. This problem was first corrected in Windows NT version 4.0 Service Pack 5.
After the hotfix has been acquired, add the following value to the registry:
WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
HKEY_LOCAL_MACHINE\system\CurrentControlSet\Services\DNS\Parameters Value Name: NoCacheRanking Data Type: REG_DWORD Value: 1
RFC 2181: Clarifications to the DNS Specification