IP Helper service memory leak in Windows Server 2008 or in Windows Vista

Symptoms

On a computer that is running Windows Server 2008 or Windows Vista, the memory usage of the IP Helper service (Iphlpsvc.dll) keeps increasing. After most of the available memory is consumed, the computer may crash, perform poorly, or encounter another exception.


This issue usually occurs when some applications or services frequently add, delete, or update filters in Application Layer Enforcement (ALE). For example, these applications could be Antivirus applications, Parental control application, or Network Address Translation (NAT) applications.


Note

  • The IP Helper service (Iphlpsvc.dll) runs in a Svchost.exe process. You can obtain the process ID of the service by using the tasklist -svc command.

  • You can use Performance Monitor to track the¬†Process\private bytes¬†performance counter of the Svchost.exe process. When this issue occurs, the value of the counter keeps increasing.


Cause

This issue occurs because the IP Helper service does not release allocated heap memory when a filter change is queried by the service.


The IP Helper service (Iphlpsvc.dll) registers a call back function to obtain notifications when any change in the ALE filters occurs. After the service receives an instance of this notification, the service queries Windows Filtering Platform (WFP) to filter a change. However, a piece of allocated heap is not released in this process. Therefore, a memory leak occurs.

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 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:

http://support.microsoft.com/contactus/?ws=supportNote 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, your computer must be running one of the following operating systems:

  • Windows Vista Service Pack 2 (SP2)

  • Windows Server 2008 Service Pack 2 (SP2)

For more information about how to obtain a Windows Vista service pack, click the following article number to view the article in the Microsoft Knowledge Base:

935791 How to obtain the latest Windows Vista service pack For more information about how to obtain a Windows Server 2008 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

968849 How to obtain the latest service pack for Windows Server 2008


Restart requirement

You may have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The English (United States) 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.

Windows Vista and Windows Server 2008 file information notes

Important Windows Vista hotfixes and Windows Server 2008 hotfixes are included in the same packages. However, only "Windows Vista" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows Vista" 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, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.

    Version

    Product

    SR_Level

    Service branch

    6.0.600
    2.
    22xxx

    Windows Vista and Windows Server 2008

    SP2

    LDR

  • Service Pack 1 is integrated into the release version of Windows Server 2008. Therefore, RTM milestone files apply only to Windows Vista. RTM milestone files have a 6.0.0000.xxxxx version number.

  • 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 and for Windows Vista" section. MUM files and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. 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 Server 2008 and of Windows Vista

File name

File version

File size

Date

Time

Platform

Iphlpsvc.dll

6.0.6002.22400

211,456

07-May-2010

16:53

x86

Tunmp.sys

6.0.6002.22400

15,360

07-May-2010

14:48

x86

Tunnel.sys

6.0.6002.22400

25,088

07-May-2010

14:48

x86

For all supported x64-based versions of Windows Server 2008 and of Windows Vista

File name

File version

File size

Date

Time

Platform

Iphlpsvc.dll

6.0.6002.22400

238,592

07-May-2010

16:49

x64

Tunmp.sys

6.0.6002.22400

18,432

07-May-2010

15:04

x64

Tunnel.sys

6.0.6002.22400

29,696

07-May-2010

15:04

x64

For all supported IA-64-based versions of Windows Server 2008

File name

File version

File size

Date

Time

Platform

Iphlpsvc.dll

6.0.6002.22400

428,544

07-May-2010

16:35

IA-64

Tunmp.sys

6.0.6002.22400

42,496

07-May-2010

15:00

IA-64

Tunnel.sys

6.0.6002.22400

69,120

07-May-2010

15:00

IA-64



Status

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

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, visit the following Microsoft Developer Network websites:

Application Layer Enforcement (ALE)

WFP Architecture

Additional file information

Additional file information for Windows Vista and for Windows Server 2008

Additional files for all supported x86-based versions of Windows Vista and of Windows Server 2008

File name

Update.mum

File version

Not applicable

File size

3,068

Date (UTC)

10-May-2010

Time (UTC)

06:41

Platform

Not applicable

File name

X86_9b45d09db90b58fe2ea20ae3101404f4_31bf3856ad364e35_6.0.6002.22400_none_a8166496cc1c512c.manifest

File version

Not applicable

File size

716

Date (UTC)

10-May-2010

Time (UTC)

06:41

Platform

Not applicable

File name

X86_microsoft-windows-i..oexistencemigration_31bf3856ad364e35_6.0.6002.22400_none_14532ce9929e4f7e.manifest

File version

Not applicable

File size

18,383

Date (UTC)

07-May-2010

Time (UTC)

19:22

Platform

Not applicable

Additional files for all supported x64-based versions of Windows Vista and of Windows Server 2008

File name

Amd64_3090793b3429029aa20e9a3ca22ed645_31bf3856ad364e35_6.0.6002.22400_none_35891e52886bef19.manifest

File version

Not applicable

File size

720

Date (UTC)

10-May-2010

Time (UTC)

06:41

Platform

Not applicable

File name

Amd64_aac3e3743422891d96a0a737bc562802_31bf3856ad364e35_6.0.6002.22400_none_6ad3ec85e2e94143.manifest

File version

Not applicable

File size

720

Date (UTC)

10-May-2010

Time (UTC)

06:41

Platform

Not applicable

File name

Amd64_microsoft-windows-i..oexistencemigration_31bf3856ad364e35_6.0.6002.22400_none_7071c86d4afbc0b4.manifest

File version

Not applicable

File size

18,443

Date (UTC)

07-May-2010

Time (UTC)

18:37

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

3,092

Date (UTC)

10-May-2010

Time (UTC)

06:41

Platform

Not applicable

File name

Wow64_microsoft-windows-i..oexistencemigration_31bf3856ad364e35_6.0.6002.22400_none_7ac672bf7f5c82af.manifest

File version

Not applicable

File size

5,465

Date (UTC)

07-May-2010

Time (UTC)

19:16

Platform

Not applicable

Additional files for all supported IA-64-based versions of Windows Server 2008

File name

Ia64_3090793b3429029aa20e9a3ca22ed645_31bf3856ad364e35_6.0.6002.22400_none_d96c26c4d00c86df.manifest

File version

Not Applicable

File size

719

Date (UTC)

10-May-2010

Time (UTC)

06:41

Platform

Not Applicable

File name

Ia64_fe06b6cdbb8cca8a9b0bd001d1fef8eb_31bf3856ad364e35_6.0.6002.22400_none_e93caf6543471340.manifest

File version

Not Applicable

File size

718

Date (UTC)

10-May-2010

Time (UTC)

06:41

Platform

Not Applicable

File name

Ia64_microsoft-windows-i..oexistencemigration_31bf3856ad364e35_6.0.6002.22400_none_1454d0df929c587a.manifest

File version

Not Applicable

File size

18,413

Date (UTC)

07-May-2010

Time (UTC)

18:05

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

2,249

Date (UTC)

10-May-2010

Time (UTC)

06:41

Platform

Not Applicable

File name

Wow64_microsoft-windows-i..oexistencemigration_31bf3856ad364e35_6.0.6002.22400_none_7ac672bf7f5c82af.manifest

File version

Not Applicable

File size

5,465

Date (UTC)

07-May-2010

Time (UTC)

19:16

Platform

Not Applicable

Need more help?

Expand your skills
Explore Training
Get new features first
Join Microsoft Insiders

Was this information helpful?

Thank you for your feedback!

Thank you for your feedback! It sounds like it might be helpful to connect you to one of our Office support agents.

×