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32-bit applications do not use the Domain Name System (DNS) cache on a computer that is running an x64-based version of Windows Server 2003 or of Windows XP

Support for Windows XP has ended

Microsoft ended support for Windows XP on April 8, 2014. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

Support for Windows Server 2003 ended on July 14, 2015

Microsoft ended support for Windows Server 2003 on July 14, 2015. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

SYMPTOMS
On a computer that is running an x64-based version of Windows Server 2003 or of Windows XP, 32-bit applications may not use the Domain Name System (DNS) cache. Even though the name that an application tries to resolve is present in the DNS cache, a DNS query is sent to a DNS server.

This behavior may generate unwanted network traffic. Also, name resolutions that use a DNS server may be slower than resolutions that use the cached entry.

Note This problem does not occur in Windows Server 2008.
WORKAROUND
To work around this behavior, add the names that you want to resolve to the hosts file. The application consults the hosts file before it contacts a DNS server.

By using this workaround, you can avoid unnecessary queries, and reduce the resolution time.
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Article ID: 973839 - Last Review: 07/30/2009 23:07:14 - Revision: 1.0

Microsoft Windows Server 2003, Datacenter x64 Edition, Microsoft Windows Server 2003, Enterprise x64 Edition, Microsoft Windows Server 2003, Standard x64 Edition, Microsoft Windows XP Professional x64 Edition

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