Microsoft KB Archive/833975

= You receive a &quot;DNS lookup failure&quot; error message and e-mail messages are returned when you send mail through a Windows Server 2003-based DNS server =

Article ID: 833975

Article Last Modified on 7/24/2007

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APPLIES TO


 * Microsoft Windows Server 2003, Standard Edition (32-bit x86)
 * Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
 * Microsoft Windows Server 2003, Enterprise x64 Edition

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SYMPTOMS
When you send e-mail messages to a domain that uses a Microsoft Windows Server 2003-based DNS server, the e-mail messages may be returned, and then you receive a &quot;DNS lookup failure&quot; error message. If you use the nslookup command-line tool to query the DNS server in this scenario, the query operation times out.



CAUSE
This problem may occur if both of the following conditions are true:
 * You use uppercase letters in the name of the destination domain when you send the e-mail message.
 * The resource record is not yet cached on the DNS server.

In this scenario, Windows Server 2003 DNS does not correctly resolve the name of the domain in the question section of the response that is returned from the server. Therefore, Windows Server 2003 DNS does not cache the resource record or send a response that contains the answer to the client. For example, this problem may occur if you send e-mail messages to mail. .com. However, this problem does not occur if you send e-mail messages to mail. .com.



Hotfix information
A supported hotfix is now available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Prerequisites
No prerequisites are required.

Restart requirement
You must restart your computer after you apply this hotfix.

Hotfix replacement information
This hotfix does not replace any other hotfixes.

File information
The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.

Windows Server 2003
Date        Time   Version        Size    File name

19-Dec-2003 18:40  5.2.3790.114  422,912  Dns.exe

Windows Server 2003 64-Bit Edition
Date        Time   Version            Size    File name -- 18-Dec-2003 23:59  5.2.3790.114   1,022,464  Dns.exe     IA-64 19-Dec-2003 18:40  5.2.3790.114     422,912  Wdns.exe    x86



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section of this article.



MORE INFORMATION
For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional query words: Case sensitive

Keywords: kbhotfixserver kbqfe kbbug kbfix kbqfe kbwinserv2003presp1fix KB833975

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