Microsoft KB Archive/929547

= Some applications and services appear to stop responding for 15 seconds after you install a Windows Filtering Platform driver on a Windows Vista-based computer =

Article ID: 929547

Article Last Modified on 9/11/2007

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APPLIES TO


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

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SYMPTOMS
Consider the following scenario. You develop a Windows Filtering Platform (WFP) driver. You install the WFP driver on a Windows Vista-based computer. In this scenario, some applications and services appear to stop responding for 15 seconds when a Domain Name System (DNS) lookup occurs. This problem occurs if the applications or the services use the DNS function.



CAUSE
This problem occurs because of an error in the Application Layer Enforcement (ALE) component.

After the Getaddrinfo function receives a DNS response, Getaddrinfo tries to close a socket. At the same time, the ALE component detects that some pending net buffer lists (NBLs) exist in Windows Vista. Then, the ALE component puts the socket in a queue. The socket stays in the queue for 15 seconds. Therefore, the applications or the services appear to stop responding for 15 seconds.



Update information
To resolve this problem, apply the update on the Windows Vista-based computer. This update removes the code where the ALE component put the socket in the queue.

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

Windows Vista, 32-bit versions
Download the 929547 package now.

Windows Vista, 64-bit versions
Download the 929547 package now.

Release Date: August 28, 2007

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.

Prerequisites
There are no prerequisites for installing this update.

Restart requirement
You must restart the computer after you apply this update.

Update replacement information
This update does not replace a previously released update.

Registry information
To use one of the updatees in this package, you do not have to make any changes to the registry.

File information
The English version of this update 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.

