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


View products that this article applies to.

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.

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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.

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Resolution

Hotfix information

A supported hotfix is 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 software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

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

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Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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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

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Keywords: KB887579, kbwinserv2003presp1fix, kbfix, kbbug, kbhotfixserver, kbqfe, kbautohotfix

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Article Info
Article ID : 887579
Revision : 11
Created on : 7/24/2007
Published on : 7/24/2007
Exists online : False
Views : 342