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A handle leak occurs in a Server Message Block (SMB) session between computers that are running Windows Vista or Windows Server 2008

Consider the following scenario:
  • In a network environment, you set up a Server Message Block (SMB) connection between two Windows Vista-based computers that use the SMB2 protocol.
  • The SMB session requires more than one roundtrip.
  • The connection is closed while Windows Vista is processing the response for the second roundtrip.
In this scenario, a handle leak may occur. Specifically, when you run the Net Session command, invalid session information is returned. This session information may indicate in the Opens column that this session has an invalid count.

After the issue occurs, you must restart the SMB service or the computer that is running this service.

Note This issue also occurs in Windows Server 2008.
This issue occurs because the process cannot remove the SMB session handle from the global session table when Windows Vista closes the SMB session.

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.

Important Windows Vista and Windows Server 2008 hotfixes are included in the same packages. However, only one of these products may be listed on the “Hotfix Request” page. To request the hotfix package that applies to both Windows Vista and Windows Server 2008, just select the product that is listed on the page.


No prerequisites are required.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other previously released hotfixes.

Registry information

To use this hotfix, you do not have to make any changes to the registry.

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 Vista and Windows Server 2008, x86-based versions
File nameFile versionFile sizeDateTimePlatform
Package_1_for_kb948572~31bf3856ad364e35~x86~~ Applicable1,94707-Mar-200818:34Not Applicable
Package_2_for_kb948572~31bf3856ad364e35~x86~~ Applicable1,78507-Mar-200818:34Not Applicable
Package_3_for_kb948572~31bf3856ad364e35~x86~~ Applicable1,78507-Mar-200818:34Not Applicable
Package_4_for_kb948572~31bf3856ad364e35~x86~~ Applicable1,78507-Mar-200818:34Not Applicable
Package_for_kb948572_client_0~31bf3856ad364e35~x86~~ Applicable1,42507-Mar-200818:34Not Applicable
Package_for_kb948572_client_1~31bf3856ad364e35~x86~~ Applicable1,36707-Mar-200818:34Not Applicable
Package_for_kb948572_client~31bf3856ad364e35~x86~~ Applicable1,71207-Mar-200818:34Not Applicable
Package_for_kb948572_sc_0~31bf3856ad364e35~x86~~ Applicable1,42107-Mar-200818:34Not Applicable
Package_for_kb948572_sc~31bf3856ad364e35~x86~~ Applicable1,42307-Mar-200818:34Not Applicable
Package_for_kb948572_server_0~31bf3856ad364e35~x86~~ Applicable1,42507-Mar-200818:34Not Applicable
Package_for_kb948572_server~31bf3856ad364e35~x86~~ Applicable1,43107-Mar-200818:34Not Applicable
Update.mumNot Applicable2,58007-Mar-200818:34Not Applicable
X86_cc7949c856dccfeedc0c0310efed9371_31bf3856ad364e35_6.0.6001.22131_none_db93dbc48bd64cf6.manifestNot Applicable70007-Mar-200818:34Not Applicable
X86_ff883672d5f6863a6ef8b0256f275cd7_31bf3856ad364e35_6.0.6000.20787_none_712176b614c58d62.manifestNot Applicable70007-Mar-200818:34Not Applicable
X86_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.0.6000.20787_none_d8407a3a12ad5388.manifestNot Applicable4,42607-Mar-200805:45Not Applicable
X86_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.0.6001.22131_none_da56c6c00fb0c0ba.manifestNot Applicable4,42607-Mar-200806:42Not Applicable
Windows Vista and Windows Server 2008, x64-based versions
File nameFile versionFile sizeDateTimePlatform
Amd64_b26427d7babc36d2068e4fdefd9ed767_31bf3856ad364e35_6.0.6000.20787_none_8ce1ed4681f62e58.manifestNot Applicable70407-Mar-200818:35Not Applicable
Amd64_d6e50401769645877c4e034cb1aa273f_31bf3856ad364e35_6.0.6001.22131_none_5b3a45e8010da88a.manifestNot Applicable70407-Mar-200818:35Not Applicable
Amd64_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.0.6000.20787_none_345f15bdcb0ac4be.manifestNot Applicable4,68807-Mar-200805:42Not Applicable
Amd64_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.0.6001.22131_none_36756243c80e31f0.manifestNot Applicable4,68807-Mar-200806:45Not Applicable
Package_1_for_kb948572~31bf3856ad364e35~amd64~~ Applicable1,95907-Mar-200818:35Not Applicable
Package_2_for_kb948572~31bf3856ad364e35~amd64~~ Applicable1,79507-Mar-200818:35Not Applicable
Package_3_for_kb948572~31bf3856ad364e35~amd64~~ Applicable1,79507-Mar-200818:35Not Applicable
Package_4_for_kb948572~31bf3856ad364e35~amd64~~ Applicable1,79507-Mar-200818:35Not Applicable
Package_for_kb948572_client_0~31bf3856ad364e35~amd64~~ Applicable1,43307-Mar-200818:35Not Applicable
Package_for_kb948572_client_1~31bf3856ad364e35~amd64~~ Applicable1,37507-Mar-200818:35Not Applicable
Package_for_kb948572_client~31bf3856ad364e35~amd64~~ Applicable1,72207-Mar-200818:35Not Applicable
Package_for_kb948572_sc_0~31bf3856ad364e35~amd64~~ Applicable1,42907-Mar-200818:35Not Applicable
Package_for_kb948572_sc~31bf3856ad364e35~amd64~~ Applicable1,43107-Mar-200818:35Not Applicable
Package_for_kb948572_server_0~31bf3856ad364e35~amd64~~ Applicable1,43307-Mar-200818:35Not Applicable
Package_for_kb948572_server~31bf3856ad364e35~amd64~~ Applicable1,43907-Mar-200818:35Not Applicable
Update.mumNot Applicable2,59807-Mar-200818:35Not Applicable
Windows Vista and Windows Server 2008, IA-64-based versions
File nameFile versionFile sizeDateTimePlatform
Ia64_eb212eba64f8b716db954576a51e9ae6_31bf3856ad364e35_6.0.6001.22131_none_096dcbc2dafafb92.manifestNot Applicable70207-Mar-200818:34Not Applicable
Ia64_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.0.6001.22131_none_da586ab60faec9b6.manifestNot Applicable4,68307-Mar-200806:45Not Applicable
Package_1_for_kb948572~31bf3856ad364e35~ia64~~ Applicable1,79007-Mar-200818:34Not Applicable
Package_2_for_kb948572~31bf3856ad364e35~ia64~~ Applicable1,79007-Mar-200818:34Not Applicable
Package_for_kb948572_sc_0~31bf3856ad364e35~ia64~~ Applicable1,42507-Mar-200818:34Not Applicable
Package_for_kb948572_sc~31bf3856ad364e35~ia64~~ Applicable1,42607-Mar-200818:34Not Applicable
Package_for_kb948572_server_0~31bf3856ad364e35~ia64~~ Applicable1,42907-Mar-200818:34Not Applicable
Package_for_kb948572_server~31bf3856ad364e35~ia64~~ Applicable1,43407-Mar-200818:34Not Applicable
Update.mumNot Applicable1,92207-Mar-200818:34Not Applicable
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information, 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

Article ID: 948572 - Last Review: 10/08/2011 09:42:00 - Revision: 3.0

Windows Server 2008 Datacenter, Windows Server 2008 Enterprise, Windows Server 2008 Standard, Windows Vista Enterprise 64-bit Edition, Windows Vista Home Basic 64-bit Edition, Windows Vista Home Premium 64-bit Edition, Windows Vista Ultimate 64-bit Edition, Windows Vista Business, Windows Vista Business 64-bit Edition, Windows Vista Enterprise, Windows Vista Home Basic, Windows Vista Home Premium, Windows Vista Ultimate, Windows Server 2008 for Itanium-Based Systems

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