Microsoft KB Archive/929451

= A client computer that is running Windows Vista registers an old IP address when the GUID of a network adapter changes =

Article ID: 929451

Article Last Modified on 8/29/2007

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APPLIES TO


 * Windows Vista Ultimate
 * Windows Vista Enterprise
 * Windows Vista Business
 * Windows Vista Home Premium
 * Windows Vista Home Basic
 * Windows Vista Ultimate 64-bit Edition
 * Windows Vista Enterprise 64-bit Edition
 * Windows Vista Business 64-bit Edition
 * Windows Vista Home Premium 64-bit Edition
 * Windows Vista Home Basic 64-bit Edition
 * Windows Vista Starter

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SYMPTOMS
When the GUID of a network adapter changes on a client computer that is running Windows Vista, the computer registers an old IP address that was associated with the old GUID.

The client computer also registers new IP addresses that are associated with the new GUID. However, because the client computer registers old IP addresses, another client computer may try to use the old IP address. If the old address is not valid, a connection failure may occur.



RESOLUTION
The following files are available for download from the Microsoft Download Center:

Windows Vista

Download the 929451 package now.

Windows Vista for 64-bit systems

Download the 929451 package now.

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to obtain Microsoft support files from online services

Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

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.

Windows Vista, 64-bit versions


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 GUID of a network adapter may change when you upgrade a computer to Windows Vista. The GUID may also change if the network adapter's configuration changes from Dynamic Host Configuration Protocol (DHCP) to static IP and then from static IP to DHCP. The old GUID and its associated IP addresses are not cleared from the DNS client configuration. Therefore, the old IP addresses remain registered for the computer. In this situation, the authoritative zone on a DNS server is populated with both IP addresses that are not valid and IP addresses that are valid. A DNS server cannot distinguish between IP addresses that are valid and IP addresses that are not valid. Therefore, when a DNS server responds to queries from client computers, the server may distribute an IP address that is not valid. If another client computer tries to use this IP address, the computer experiences a connection failure.

For more information about how hotfix packages are named, click the following article number to view the article in the Microsoft Knowledge Base:

816915 New file naming schema for Microsoft Windows software update packages

For more information about the terms that are used to describe software updates, 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: Winx64 Windowsx64 64bit 64-bit

Keywords: kbbug kbfix kbqfe atdownload kbexpertiseinter kbhotfixserver KB929451

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