Description of a hotfix that adds Compound TCP (CTCP) support to computers that are running Windows Server 2003 or a 64-bit version of Windows XP

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Article ID: 949316 - View products that this article applies to.
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INTRODUCTION

A hotfix is available to add Compound TCP (CTCP) support to computers that are running Windows Server 2003 or a 64-bit version of Windows XP. CTCP aggressively adjusts the congestion window of the sender to optimize TCP for connections with large bandwidth-delay products. These products include Video on Demand for Windows Server 2003 and for 64-bit versions of Windows XP.

Note CTCP support was introduced in Windows Vista and in Windows Server 2008.

MORE INFORMATION

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:
http://support.microsoft.com/contactus/?ws=support
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.

Prerequisites

To apply this hotfix, you must have Windows Server 2003 Service Pack 1 or Windows Server 2003 Service Pack 2 installed.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

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 Server 2003 Service Pack 1, x86-based versions
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File nameFile versionFile sizeDateTimePlatform
Tcpip.sys5.2.3790.3094393,72821-Feb-200810:04x86
Windows Server 2003 Service Pack 2, x86-based versions
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File nameFile versionFile sizeDateTimePlatform
Tcpip.sys5.2.3790.4241390,14421-Feb-200810:42x86
Windows Server 2003 Service Pack 1, Itanium-based versions
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File nameFile versionFile sizeDateTimePlatform
Tcpip.sys5.2.3790.30941,305,60021-Feb-200817:43IA-64
Windows Server 2003 Service Pack 2, Itanium-based versions
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File nameFile versionFile sizeDateTimePlatform
Tcpip.sys5.2.3790.42411,307,64821-Feb-200818:38IA-64
Windows Server 2003, x64 based versions
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File nameFile versionFile sizeDateTimePlatform
Tcpip.sys5.2.3790.3094826,88021-Feb-200817:43x64
Windows Server 2003 Service Pack 2, x64 based versions
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Tcpip.sys5.2.3790.4241781,82421-Feb-200818:38x64

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:
http://support.microsoft.com/contactus/?ws=support
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.

Prerequisites

To apply this hotfix, you must have a 64-bit version of Windows XP installed.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

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 XP, x64-based versions
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Tcpip.sys5.2.3790.3094826,88021-Feb-200817:43x64
Windows XP Service Pack 2, x64-based versions
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Tcpip.sys5.2.3790.4241781,82421-Feb-200818:38x64
Note When you apply this hotfix, the following registry subkey is created:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
The properties of this subkey are as follows:
Name: TCPCongestionControl
Type: REG_DWORD
Value: 1
When the value is set to 1, CTCP support is enabled. When the value is set to 0, CTCP support is disabled.

STATUS

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

MORE INFORMATION

Compound TCP (CTCP) aggressively increases the send window for connections with large receive window sizes and bandwidth-delay products (BDPs). CTCP tries to maximize throughput on these types of connections by monitoring delay variations and losses. Additionally, CTCP makes sure that its behavior does not adversely affect other TCP connections.

For more information about software update terminology, 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

Properties

Article ID: 949316 - Last Review: October 8, 2011 - Revision: 4.0
APPLIES TO
  • Microsoft Windows Server 2003, Web Edition
  • Microsoft Windows Server 2003, Standard Edition (32-bit x86)
  • Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
  • Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
  • Microsoft Windows Server 2003, Datacenter Edition for Itanium-Based Systems
  • Microsoft Windows Server 2003, Enterprise Edition for Itanium-based Systems
  • Microsoft Windows Server 2003, Datacenter x64 Edition
  • Microsoft Windows Server 2003, Enterprise x64 Edition
  • Microsoft Windows Server 2003, Standard x64 Edition
  • Microsoft Windows XP Professional x64 Edition
Keywords: 
kbautohotfix kbbug kbfix kbhotfixserver kbqfe KB949316

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