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TCP Congestion Window Does Not Return to Optimal Length in Bidirectional Communication Streams


View products that this article applies to.

Symptoms

In communication streams where there is bidirectional traffic, the TCP congestion window may not return to an optimal length for the network conditions.

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Cause

TCP/IP applications that send high volumes of data and receive small replies may affect the NT4 stack (specifically the Tcpip.sys file) in such a way that throughput is continually diminished on a particular socket connection.

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Resolution

Windows Server 2003

Hotfix information

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.
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 tool in Control Panel.
Date          Time  Version         Size   File name 
--------------------------------------------------------
14-Jan-2004   09:58 5.2.3790.118 334,336   Tcpip.sys

Windows XP

Hotfix information

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.
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 tool in Control Panel.
   Date         Time   Version        Size     File name
   -----------------------------------------------------
   23-Aug-2003  11:27  5.1.2600.1271  339,968  Tcpip.sys

Windows 2000

Hotfix information

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.
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 tool in Control Panel.
   Date         Time   Version        Size     File name
   --------------------------------------------------------
   18-Jul-2003  17:00  5.0.2195.6787  118,992  Afd.sys
   28-Jul-2003  20:27  5.0.2195.6602  108,816  Msafd.dll
   18-Jul-2003  17:33  5.0.2195.6787  314,928  Tcpip.sys
   15-Jan-2003  17:56  5.0.2195.6655   16,240  Tdi.sys
   28-Jul-2003  20:27  5.0.2195.6601   17,680  Wshtcpip.dll

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Status

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

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More information

If response frames come back out of order, load-balanced links and frame relay links will aggravate this problem. The round-trip time counter incorrectly interprets frames that are out of order as congestion and triggers congestion avoidance. On high-latency networks, the send window drops very low and may cause substantial delays. For additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the article number below to view the article in the Microsoft Knowledge Base:
265173� The Datacenter Program and Windows 2000 Datacenter Server Product

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Keywords: kbautohotfix, kbhotfixserver, kbqfe, kbqfe, kbwin2000presp4fix, kbfix, kbbug, KB816496

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Article Info
Article ID : 816496
Revision : 16
Created on : 7/24/2007
Published on : 7/24/2007
Exists online : False
Views : 435