"C000021B" error when you inject an NBL that contains multiple net buffers in Windows 7 SP1 or Windows Server 2008 R2 SP1

View products that this article applies to.

Symptoms

Assume that you try to inject a Net Buffer List (NBL) that contains multiple net buffers on a computer that is running Windows 7 Service Pack 1 (SP1) or Windows Server 2008 R2 SP1. In this situation, the injection fails. Additionally, FwpsInjectNetworkSendAsync0 method returns error code C000021B.

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Cause

This issue occurs because an incorrect algorithm is used to identify if all net buffers have the same IP header.

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Resolution

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.

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, submit a request to 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 website:

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 be running Windows 7 SP1 or Windows Server 2008 R2 SP1. For more information about how to obtain a Windows 7 or Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

976932 Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Registry information

To use the update in this package, you do not have to make any changes to the registry.

Restart requirement

You have to restart the computer after you apply this update.

Update replacement information

This update does not replace a previously released update.

File information

The global version of this update installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files

Windows 7 and Windows Server 2008 R2 file information notes

Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:
Version Product Milestone Service branch
6.1.760 1.17xxx Windows 7 and Windows Server 2008 R2 SP1 GDR
6.1.760
1.22xxx Windows 7 and Windows Server 2008 R2 SP1 LDR
GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.
The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows 7 and for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

Version	Product	Milestone	Service branch
6.1.760 1.17xxx	Windows 7 and Windows Server 2008 R2	SP1	GDR
6.1.760 1.22xxx	Windows 7 and Windows Server 2008 R2	SP1	LDR

For all supported x86-based versions of Windows 7 SP1 and Windows Server 2008 R2 SP1

File name	Netio.sys
File version	6.1.7601.17939
File size	240,496
Date (UTC)	22-Aug-2012
Time (UTC)	17:16
Platform	x86

File name	Netio.sys
File version	6.1.7601.22383
File size	240,576
Date (UTC)	13-Jul-2013
Time (UTC)	04:35
Platform	x86

File name	Fwpkclnt.sys
File version	6.1.7601.18042
File size	187,752
Date (UTC)	03-Jan-2013
Time (UTC)	05:04
Platform	x86

File name	Tcpip.sys
File version	6.1.7601.18209
File size	1,294,272
Date (UTC)	13-Jul-2013
Time (UTC)	05:17
Platform	x86

File name	Fwpkclnt.sys
File version	6.1.7601.22383
File size	187,840
Date (UTC)	13-Jul-2013
Time (UTC)	04:35
Platform	x86

File name	Tcpip.sys
File version	6.1.7601.22383
File size	1,309,120
Date (UTC)	13-Jul-2013
Time (UTC)	04:35
Platform	x86

For all supported x64-based versions of Windows 7 SP1 and Windows Server 2008 R2 SP1

File name	Netio.sys
File version	6.1.7601.17939
File size	376,688
Date (UTC)	22-Aug-2012
Time (UTC)	18:12
Platform	x64

File name	Netio.sys
File version	6.1.7601.22383
File size	376,768
Date (UTC)	13-Jul-2013
Time (UTC)	05:25
Platform	x64

File name	Fwpkclnt.sys
File version	6.1.7601.18042
File size	288,088
Date (UTC)	03-Jan-2013
Time (UTC)	06:00
Platform	x64

File name	Tcpip.sys
File version	6.1.7601.18209
File size	1,909,696
Date (UTC)	13-Jul-2013
Time (UTC)	05:59
Platform	x64

File name	Fwpkclnt.sys
File version	6.1.7601.22383
File size	288,192
Date (UTC)	13-Jul-2013
Time (UTC)	05:25
Platform	x64

File name	Tcpip.sys
File version	6.1.7601.22383
File size	1,901,504
Date (UTC)	13-Jul-2013
Time (UTC)	05:25
Platform	x64

For all supported IA64-based versions of Windows 7 SP1 and Windows Server 2008 R2 SP1

File name	Netio.sys
File version	6.1.7601.17939
File size	711,024
Date (UTC)	22-Aug-2012
Time (UTC)	16:51
Platform	IA-64

File name	Netio.sys
File version	6.1.7601.22383
File size	711,104
Date (UTC)	13-Jul-2013
Time (UTC)	04:36
Platform	IA-64

File name	Fwpkclnt.sys
File version	6.1.7601.18042
File size	482,152
Date (UTC)	03-Jan-2013
Time (UTC)	04:45
Platform	IA-64

File name	Tcpip.sys
File version	6.1.7601.18209
File size	3,797,952
Date (UTC)	13-Jul-2013
Time (UTC)	04:55
Platform	IA-64

File name	Fwpkclnt.sys
File version	6.1.7601.22383
File size	482,240
Date (UTC)	13-Jul-2013
Time (UTC)	04:36
Platform	IA-64

File name	Tcpip.sys
File version	6.1.7601.22383
File size	3,823,040
Date (UTC)	13-Jul-2013
Time (UTC)	04:36
Platform	IA-64

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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.

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More Information

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

For more information about this issue, click the following article number to view the article in the Microsoft Knowledge Base:

2393659 A DHCP client computer that has multiple network adapters and that is running Windows 7 or Windows Server 2008 R2 cannot renew a DHCP lease when the computer wakes

Additional file information

Additional file information for Windows 7 SP1 and Windows Server 2008 R2 SP1

Additional files for all supported x86-based versions of Windows 7 SP1 and Windows Server 2008 R2 SP1

File name	X86_1cddce538be1c5d098ddae051a6fc757_31bf3856ad364e35_6.1.7601.22383_none_013e3e001f833832.manifest
File version	Not applicable
File size	1,054
Date (UTC)	15-Jul-2013
Time (UTC)	14:20
Platform	Not applicable

File name	X86_474eb332ced33916e07860ed41aed08b_31bf3856ad364e35_6.1.7601.17939_none_f04567b8d165ac6f.manifest
File version	Not applicable
File size	1,054
Date (UTC)	15-Jul-2013
Time (UTC)	14:20
Platform	Not applicable

File name	X86_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.17939_none_58923ff3139b4b9b.manifest
File version	Not applicable
File size	2,540
Date (UTC)	22-Aug-2012
Time (UTC)	17:35
Platform	Not applicable

File name	X86_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.22383_none_58dfa7542ce70ca0.manifest
File version	Not applicable
File size	2,540
Date (UTC)	13-Jul-2013
Time (UTC)	05:00
Platform	Not applicable

File name	X86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.18209_none_b5353121c49bdeef.manifest
File version	Not applicable
File size	3,780
Date (UTC)	15-Jul-2013
Time (UTC)	14:23
Platform	Not applicable

File name	X86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.22383_none_b5624cd0ddffc637.manifest
File version	Not applicable
File size	3,834
Date (UTC)	13-Jul-2013
Time (UTC)	05:01
Platform	Not applicable

Additional files for all supported x64-based versions of Windows 7 SP1 and Windows Server 2008 R2 SP1

File name	Amd64_1d7a1690a27c3ff8b55d554fc6c8aa26_31bf3856ad364e35_6.1.7601.22383_none_292c37a34f8fc615.manifest
File version	Not applicable
File size	1,060
Date (UTC)	15-Jul-2013
Time (UTC)	14:20
Platform	Not applicable

File name	Amd64_54a67f43730ff47874c04e9e2c6a0514_31bf3856ad364e35_6.1.7601.22383_none_885ddb69790de390.manifest
File version	Not applicable
File size	1,414
Date (UTC)	15-Jul-2013
Time (UTC)	14:20
Platform	Not applicable

File name	Amd64_805777f7d8f44bd578dcc30209256606_31bf3856ad364e35_6.1.7601.17939_none_023d4a484a0d315d.manifest
File version	Not applicable
File size	1,414
Date (UTC)	15-Jul-2013
Time (UTC)	14:20
Platform	Not applicable

File name	Amd64_c6401fc829e4e57fd1a8c82dc26a0d84_31bf3856ad364e35_6.1.7601.22383_none_87a327368e370387.manifest
File version	Not applicable
File size	712
Date (UTC)	15-Jul-2013
Time (UTC)	14:20
Platform	Not applicable

File name	Amd64_e0bb77f53fa4963677fedd1bd4030634_31bf3856ad364e35_6.1.7601.17939_none_16ef7564ca67bdb9.manifest
File version	Not applicable
File size	1,060
Date (UTC)	15-Jul-2013
Time (UTC)	14:20
Platform	Not applicable

File name	Amd64_f0ed83bda0697abd97fd471015aed5c2_31bf3856ad364e35_6.1.7601.17939_none_f48525cb7b29d619.manifest
File version	Not applicable
File size	712
Date (UTC)	15-Jul-2013
Time (UTC)	14:20
Platform	Not applicable

File name	Amd64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.17939_none_b4b0db76cbf8bcd1.manifest
File version	Not applicable
File size	2,542
Date (UTC)	22-Aug-2012
Time (UTC)	18:33
Platform	Not applicable

File name	Amd64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.22383_none_b4fe42d7e5447dd6.manifest
File version	Not applicable
File size	2,542
Date (UTC)	13-Jul-2013
Time (UTC)	05:50
Platform	Not applicable

File name	Amd64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.18209_none_1153cca57cf95025.manifest
File version	Not applicable
File size	3,784
Date (UTC)	15-Jul-2013
Time (UTC)	14:27
Platform	Not applicable

File name	Amd64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.22383_none_1180e854965d376d.manifest
File version	Not applicable
File size	3,838
Date (UTC)	13-Jul-2013
Time (UTC)	05:54
Platform	Not applicable

File name	Wow64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.17939_none_bf0585c900597ecc.manifest
File version	Not applicable
File size	1,166
Date (UTC)	22-Aug-2012
Time (UTC)	17:23
Platform	Not applicable

File name	Wow64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.22383_none_bf52ed2a19a53fd1.manifest
File version	Not applicable
File size	1,166
Date (UTC)	13-Jul-2013
Time (UTC)	04:45
Platform	Not applicable

Additional files for all supported IA64-based versions of Windows 7 SP1 and Windows Server 2008 R2 SP1

File name	Ia64_b5a68917f3799fcfaa3161aa0eacb343_31bf3856ad364e35_6.1.7601.22383_none_b5a4c887838d56b6.manifest
File version	Not applicable
File size	1,411
Date (UTC)	15-Jul-2013
Time (UTC)	14:20
Platform	Not applicable

File name	Ia64_d8c1375e947d162e9a95ea092ba61229_31bf3856ad364e35_6.1.7601.17939_none_0c30858288632e71.manifest
File version	Not applicable
File size	1,411
Date (UTC)	15-Jul-2013
Time (UTC)	14:20
Platform	Not applicable

File name	Ia64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.17939_none_5893e3e913995497.manifest
File version	Not applicable
File size	2,541
Date (UTC)	22-Aug-2012
Time (UTC)	18:25
Platform	Not applicable

File name	Ia64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.22383_none_58e14b4a2ce5159c.manifest
File version	Not applicable
File size	2,541
Date (UTC)	13-Jul-2013
Time (UTC)	05:01
Platform	Not applicable

File name	Ia64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.18209_none_b536d517c499e7eb.manifest
File version	Not applicable
File size	3,782
Date (UTC)	15-Jul-2013
Time (UTC)	14:20
Platform	Not applicable

File name	Ia64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.22383_none_b563f0c6ddfdcf33.manifest
File version	Not applicable
File size	3,836
Date (UTC)	13-Jul-2013
Time (UTC)	05:03
Platform	Not applicable

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Applies to:

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Keywords: kb, kbautohotfix, kbqfe, kbhotfixserver, kbfix, kbsurveynew, kbexpertiseadvanced

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Article Info

Article ID	:	2871565
Revision	:	1
Created on	:	1/7/2017
Published on	:	8/15/2013
Exists online	:	False
Views	:	250

Microsoft KB Archive Search

"C000021B" error when you inject an NBL that contains multiple net buffers in Windows 7 SP1 or Windows Server 2008 R2 SP1

Symptoms

Cause

Resolution

Hotfix information

Prerequisites

Registry information

Restart requirement

Update replacement information

Windows 7 and Windows Server 2008 R2 file information notes

For all supported x86-based versions of Windows 7 SP1 and Windows Server 2008 R2 SP1

For all supported x64-based versions of Windows 7 SP1 and Windows Server 2008 R2 SP1

For all supported IA64-based versions of Windows 7 SP1 and Windows Server 2008 R2 SP1

Status

More Information

Additional file information

Additional files for all supported x86-based versions of Windows 7 SP1 and Windows Server 2008 R2 SP1

Additional files for all supported x64-based versions of Windows 7 SP1 and Windows Server 2008 R2 SP1

Additional files for all supported IA64-based versions of Windows 7 SP1 and Windows Server 2008 R2 SP1

Applies to: