You have a computer that is running Windows Vista, Windows 7, Windows Server 2008, or Windows Server 2008 R2. You install an application that uses a Windows Filtering Platform (WFP) callout driver. After the application is running for some time, a memory leak may occur in the nonpaged pool memory. In this situation, you may experience low performance on the computer.
Note WFP callout drivers are usually used in third-party antivirus and firewall programs.
When the WFP callout driver blocks a packet that has multiple Net Buffer List (NBL) chains, the last NBL in the chain is not released by the WFP callout driver correctly. This causes a nonpaged pool memory leak.
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 the problem described in this article. 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.
Prerequisites
To apply this hotfix, you must be running Windows Vista, Windows 7, Windows Server 2008, or Windows Server 2008 R2.
Registry information
To use the hotfix in this package, you do not have to make any changes to the registry.
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 global version of this hotfix 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.
For all supported x86-based versions of Windows Server 2008 and of Windows Vista
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
Netio.sys
6.0.6001.22659
220,040
22-Mar-2010
16:37
x86
Netio.sys
6.0.6002.22369
221,568
22-Mar-2010
17:40
x86
Bfe.dll
6.0.6001.22659
328,704
22-Mar-2010
16:05
x86
Fwpkclnt.sys
6.0.6001.22659
98,184
22-Mar-2010
16:37
x86
Fwpuclnt.dll
6.0.6001.22659
595,456
22-Mar-2010
16:06
x86
Ikeext.dll
6.0.6001.22659
438,272
22-Mar-2010
16:06
x86
Wfp.mof
Not Applicable
814
04-Mar-2010
05:54
Not Applicable
Wfp.tmf
Not Applicable
208,966
22-Mar-2010
14:37
Not Applicable
Tcpip.sys
6.0.6001.22659
902,024
22-Mar-2010
16:37
x86
For all supported x64-based versions of Windows Server 2008 and of Windows Vista
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
Netio.sys
6.0.6001.22659
342,920
22-Mar-2010
17:06
x64
Netio.sys
6.0.6002.22369
345,984
22-Mar-2010
17:43
x64
Bfe.dll
6.0.6001.22659
458,240
22-Mar-2010
16:32
x64
Fwpkclnt.sys
6.0.6001.22659
165,256
22-Mar-2010
17:06
x64
Fwpuclnt.dll
6.0.6001.22659
779,776
22-Mar-2010
16:33
x64
Ikeext.dll
6.0.6001.22659
454,656
22-Mar-2010
16:33
x64
Wfp.mof
Not Applicable
814
26-Feb-2010
04:14
Not Applicable
Wfp.tmf
Not Applicable
207,475
22-Mar-2010
15:04
Not Applicable
Tcpip.sys
6.0.6001.22659
1,414,024
22-Mar-2010
17:06
x64
Fwpuclnt.dll
6.0.6001.22659
595,456
22-Mar-2010
16:06
x86
Wfp.mof
Not Applicable
814
04-Mar-2010
05:54
Not Applicable
For all supported IA-64-based versions of Windows Server 2008
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
Netio.sys
6.0.6001.22659
638,344
22-Mar-2010
16:32
IA-64
Netio.sys
6.0.6002.22369
642,432
22-Mar-2010
17:35
IA-64
Bfe.dll
6.0.6001.22659
781,312
22-Mar-2010
15:58
IA-64
Fwpkclnt.sys
6.0.6001.22659
261,000
22-Mar-2010
16:32
IA-64
Fwpuclnt.dll
6.0.6001.22659
1,122,304
22-Mar-2010
15:59
IA-64
Ikeext.dll
6.0.6001.22659
925,696
22-Mar-2010
16:00
IA-64
Wfp.mof
Not Applicable
814
25-Feb-2010
07:43
Not Applicable
Wfp.tmf
Not Applicable
208,053
22-Mar-2010
14:46
Not Applicable
Tcpip.sys
6.0.6001.22659
2,941,320
22-Mar-2010
16:33
IA-64
Fwpuclnt.dll
6.0.6001.22659
595,456
22-Mar-2010
16:06
x86
Wfp.mof
Not Applicable
814
04-Mar-2010
05:54
Not Applicable
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 MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2 and for Windows 7" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important 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.
For all supported x86-based versions of Windows 7
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
Netio.sys
6.1.7600.20611
240,000
07-Jan-2010
09:19
x86
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
Netio.sys
6.1.7600.20611
374,664
07-Jan-2010
09:50
x64
For all supported IA-64-based versions of Windows Server 2008 R2
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