Microsoft KB Archive/932380

= The UUID that you create in Windows XP is only unique on the local computer =

Article ID: 932380

Article Last Modified on 8/29/2007

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APPLIES TO


 * Microsoft Windows XP Professional
 * Microsoft Windows XP Home Edition

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SYMPTOMS
When you create a universally unique identifier (UUID) on a computer that is running Microsoft Windows XP, the UUID that you create is only unique on the local computer. This problem occurs if a Microsoft Windows Mobile 5.0-based device is connected to the computer by using a USB connector.

Specifically, if you use the UuidCreateSequential function to create a UUID, the UuidCreateSequential function returns an RPC_S_UUID_LOCAL_ONLY value. This value indicates that the UUID is guaranteed to be unique only on the local computer. If you use the Uuidgen.exe tool to create a UUID, the Uuidgen.exe tool returns a UUID, and the Uuidgen.exe tool displays the following warning message:

Warning: Unable to determine your network address. The UUID generated is unique on this computer only. It should not be used on another computer.

Note This problem does not occur if a Microsoft Windows Mobile 2003-based device is connected to the computer.



CAUSE
This problem occurs because the connection to the Windows Mobile 5.0-based device creates a Remote Network Driver Interface Specification (RNDIS) adapter. The RNDIS adapter is a pseudo-network adapter. This RNDIS adapter contains a media access control (MAC) address that is not universally unique. The UuidCreateSequential function incorrectly uses this MAC address to generate the UUID.



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
To apply this hotfix, you must have Windows XP Service Pack 2 (SP2) installed on the computer. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

322389 How to obtain the latest Windows XP service pack

Restart requirement
You must restart the 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 item in Control Panel.



WORKAROUND
To work around this problem, disconnect the Windows Mobile 5.0-based device when you create the UUID.



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
The UuidCreateSequential function returns an RPC_S_UUID_LOCAL_ONLY value instead of an RPC_S_OK value when the computer does not have an Ethernet address or a token ring address. For more information, visit the following Microsoft Web site:

http://msdn2.microsoft.com/en-us/library/aa379322.aspx

The Uuidgen.exe tool is available in Microsoft Platform Software Development Kit (SDK). You can use this tool to create a UUID. For more information, visit the following Microsoft Web site:

http://msdn2.microsoft.com/en-us/library/aa373930.aspx

For more 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: kbexpertiseinter kbwinxppresp3fix kbfix kbbug kbhotfixserver kbqfe kbpubtypekc KB932380

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