FIX: Error message when you call the WSADuplicateSocket function to duplicate a 32-bit socket to a 64-bit socket on a computer that uses IPv6: "WSAENOTSOCK"

On a computer that is running Microsoft Windows XP Professional 64-bit edition or Microsoft Windows Server 2003 64-bit edition, you may receive the following error message: You may experience this problem if the following conditions are true:

• You use Internet Protocol version 6 (IPv6).
• You call the WSADuplicateSocket function to duplicate a 32-bit socket to a 64-bit socket.

Note This problem may not occur when a 32-bit socket tries to duplicate a 32-bit socket, or a 64-bit socket tries to duplicate a 64-bit socket.

This problem occurs because a 32-bit socket handle is 4 bytes and a 64-bit process handle is 8 bytes. This difference causes the WSHGetSocketInformation function to fail when an 8-byte socket handle is imported into a 4-byte socket.

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

There are no prerequisites for this hotfix.

Restart requirement

You do not have to restart the computer after you apply this hotfix.

Hotfix replacement 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 item in Control Panel.

Windows Server 2003 SP1, x64-based versions, and Windows XP Professional x64 Edition

Windows Server 2003 SP2, x64-based versions, and Windows XP Professional x64 Edition

Windows Server 2003 SP1, Itanium-based versions

Windows Server 2003 SP2, Itanium-based versions

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

For more information, click the following article number to view the article in the Microsoft Knowledge Base: