Microsoft KB Archive/887579

= The gethostbyname function does not return the correct IP address for the local computer in Windows Server 2003 =

Article ID: 887579

Article Last Modified on 7/24/2007

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APPLIES TO


 * Microsoft Windows Server 2003, Web Edition
 * 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 try to run a program that uses the gethostbyname function to obtain the IP addresses of the local computer on a multi-homed Microsoft Windows Server 2003-based computer, the wrong IP address may be returned.

If you use a hosts file that contains entries for the local computer, the gethostbyname function receives the IP addresses that are configured in the hosts file instead of the IP addresses that are configured on each interface.



CAUSE
This problem occurs because the gethostbyname function that is used in Windows Server 2003 does not handle the local computer name as earlier versions of the gethostbyname function handled the local computer name.



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 file attributes) 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, 64-bit editions
Date        Time   Version             Size   File name -- 12-Oct-2004 15:46  5.2.3790.221      687,616  Mswsock.dll         IA-64 12-Oct-2004 15:45  5.2.3790.221      230,400  Wmswsock.dll

Windows Server 2003, 32-bit editions
 Date        Time   Version             Size   File name -- 13-Oct-2004 00:45  5.2.3790.221      260,096  Mswsock.dll



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



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

Keywords: kbqfe kbhotfixserver kbbug kbfix kbwinserv2003presp1fix KB887579

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