Microsoft KB Archive/935458

= The behavior of TCP acknowledgments (ACKs) does not change after you modify the TcpAckFrequency registry entry in Windows Vista =

Article ID: 935458

Article Last Modified on 8/24/2007

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APPLIES TO


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

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SYMPTOMS
On a computer that is running Windows Vista, you modify the TcpAckFrequency registry entry by following the steps that are described in Microsoft Knowledge Base article 328890. However, the behavior of TCP acknowledgments (ACKs) does not change.



Prerequisites
There are no prerequisites.

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

Hotfix replacement information
This hotfix does not replace any other hotfixes.

Registry information
You do not have to make any changes to the registry.

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
For more information about the TcpAckFrequency registry entry, click the following article numbers to view the articles in the Microsoft Knowledge Base:  

328890 New registry entry for controlling the TCP Acknowledgment (ACK) behavior in Windows XP and in Windows Server 2003

 

823764 Slow performance occurs when you copy data to a TCP server by using a Windows Sockets API program



For more information about TCP/IP registry values in Windows Vista and in Windows Server Code Name &quot;Longhorn,&quot; see the &quot;TCP/IP Registry Values for Microsoft Windows Vista and Windows Server 'Longhorn'&quot; white paper. To obtain this white paper, visit the following Microsoft Web site:

http://download.microsoft.com/download/c/2/6/c26893a6-46c7-4b5c-b287-830216597340/TCPIP_Reg.doc

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: TcpDelAckTicks

Keywords: kbfix kbqfe kbpubtypekc atdownload kbexpertiseadvanced kbexpertisebeginner kbhotfixserver KB935458

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