Terminal Services performance counters report an incorrect number of sessions when a heavy load situation occurs in Windows Server 2008 R2 or in Windows Server 2008

Article ID: 982303 - View products that this article applies to.
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SYMPTOMS

Consider the following scenario:
  • You install the Remote Desktop Services role on a computer that is running Windows Server 2008 R2 or you install the Terminal Service role on a computer that is running Windows Server 2008.
  • You use Performance Monitor to collect the following performance counters:
    • Terminal Services\Active Sessions
    • Terminal Services\Inactive Sessions
    • Terminal Services\Total Sessions
  • Remote Desktop Services is under a heavy load.
In this scenario, the number that the performance counters return is sometimes incorrect. For example, the Active Sessions counter returns an invalid number of sessions. You expect the counter to return 0.

Note When the actual number of active sessions is 0, the Active Sessions counter returns 4294967295. This value represents a value of -1.
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CAUSE

The issue occurs because of a race condition in the Local Session Manager (Lsm.exe) process. When the race condition occurs, the performance counters are not updated when a Remote Desktop Services session is disconnected. This behavior causes that the number of active sessions to be one less than the actual value.
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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 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=support
(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 one of the following operating systems:
  • Windows Server 2008
  • Windowe Server 2008 Service Pack 2 (SP2)
  • Windows Server 2008 R2
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
968849
(http://support.microsoft.com/kb/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 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.
    Collapse this tableExpand this table
    VersionProductSR_LevelService branch
    6.0.600 0 . 20xxxWindows VistaRTMLDR
    6.0.600 1 . 22xxxWindows Vista and Windows Server 2008SP1LDR
    6.0.600 2 . 22xxxWindows Vista and Windows Server 2008SP2LDR
  • 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" section. MUM 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 x64-based versions of Windows Server 2008
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Lsm.exe6.0.6001.22689265,21611-May-201015:03x64
Lsm.exe6.0.6002.22402265,21611-May-201015:27x64
Lsm.exe6.0.6001.22689230,40011-May-201014:38x86
Lsm.exe6.0.6002.22402230,40011-May-201015:09x86


For all supported IA-64-based versions of Windows Server 2008
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Lsm.exe6.0.6001.22689534,01611-May-201014:50IA-64
Lsm.exe6.0.6002.22402534,01611-May-201015:24IA-64
Lsm.exe6.0.6001.22689230,40011-May-201014:38x86
Lsm.exe6.0.6002.22402230,40011-May-201015:09x86

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" section. MUM 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 x64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Lsm.exe6.1.7600.20708334,84806-May-201011:43x64
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WORKAROUND

To work around this issue, use the WTSEnumerateSessions function to retrieve the number of sessions.
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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
(http://support.microsoft.com/kb/824684/ )
Description of the standard terminology that is used to describe Microsoft software updates
For more information about terminal server performance monitor, click the following article number to view the article in the Microsoft Knowledge Base:
186536
(http://support.microsoft.com/kb/186536/ )
Description of terminal server performance monitor objects and counters

For more information about the WTSEnumerateSessions function, visit the following Microsoft Developer Network (MSDN) Web site:
Description of the WTSEnumerateSessions function
(http://msdn.microsoft.com/en-us/library/aa383833(VS.85).aspx)

Additional file information

Additional file information for Windows Server 2008

Additional files for all supported x64-based versions of Windows Server 2008
Collapse this tableExpand this table
File nameAmd64_48289569954b898c4e0cdd98616b21e7_31bf3856ad364e35_6.0.6001.22689_none_0d4fb84a978b5991.manifest
File versionNot applicable
File size728
Date (UTC)12-May-2010
Time (UTC)03:00
PlatformNot applicable
File nameAmd64_9198b0166558c823b6702a4e76b2da9e_31bf3856ad364e35_6.0.6002.22402_none_55810e93a5ae70a4.manifest
File versionNot applicable
File size1,096
Date (UTC)12-May-2010
Time (UTC)03:00
PlatformNot applicable
File nameAmd64_b10ef9cc257a559bff725e74c6ed5d71_31bf3856ad364e35_6.0.6001.22689_none_262b01f8d9687b01.manifest
File versionNot applicable
File size1,096
Date (UTC)12-May-2010
Time (UTC)03:00
PlatformNot applicable
File nameAmd64_microsoft-windows-t..localsessionmanager_31bf3856ad364e35_6.0.6001.22689_none_019f91c7dc3e75e7.manifest
File versionNot applicable
File size24,308
Date (UTC)11-May-2010
Time (UTC)18:02
PlatformNot applicable
File nameAmd64_microsoft-windows-t..localsessionmanager_31bf3856ad364e35_6.0.6002.22402_none_03d582efd92a3749.manifest
File versionNot applicable
File size24,308
Date (UTC)11-May-2010
Time (UTC)18:52
PlatformNot applicable
File nameX86_microsoft-windows-t..localsessionmanager_31bf3856ad364e35_6.0.6001.22689_none_a580f64423e104b1.manifest
File versionNot applicable
File size24,286
Date (UTC)11-May-2010
Time (UTC)17:32
PlatformNot applicable
File nameX86_microsoft-windows-t..localsessionmanager_31bf3856ad364e35_6.0.6002.22402_none_a7b6e76c20ccc613.manifest
File versionNot applicable
File size24,286
Date (UTC)11-May-2010
Time (UTC)18:44
PlatformNot applicable
Additional files for all supported IA-64-based versions of Windows Server 2008
Collapse this tableExpand this table
File nameIa64_33ecff86518a7cd9efcb876fd9aae7fc_31bf3856ad364e35_6.0.6002.22402_none_8567d36614580652.manifest
File versionNot applicable
File size1,094
Date (UTC)12-May-2010
Time (UTC)03:00
PlatformNot applicable
File nameIa64_a90fe4130899028f1a3e5409e1af69e9_31bf3856ad364e35_6.0.6001.22689_none_ad34b40bae0d5bf2.manifest
File versionNot applicable
File size1,094
Date (UTC)12-May-2010
Time (UTC)03:00
PlatformNot applicable
File nameIa64_b7c7ca8e6140f18803a74265c815cc86_31bf3856ad364e35_6.0.6001.22689_none_d17eb523143fc4ba.manifest
File versionNot applicable
File size726
Date (UTC)12-May-2010
Time (UTC)03:00
PlatformNot applicable
File nameIa64_microsoft-windows-t..localsessionmanager_31bf3856ad364e35_6.0.6001.22689_none_a5829a3a23df0dad.manifest
File versionNot applicable
File size24,297
Date (UTC)11-May-2010
Time (UTC)17:17
PlatformNot applicable
File nameIa64_microsoft-windows-t..localsessionmanager_31bf3856ad364e35_6.0.6002.22402_none_a7b88b6220cacf0f.manifest
File versionNot applicable
File size24,297
Date (UTC)11-May-2010
Time (UTC)18:19
PlatformNot applicable
File nameX86_microsoft-windows-t..localsessionmanager_31bf3856ad364e35_6.0.6001.22689_none_a580f64423e104b1.manifest
File versionNot applicable
File size24,286
Date (UTC)11-May-2010
Time (UTC)17:32
PlatformNot applicable
File nameX86_microsoft-windows-t..localsessionmanager_31bf3856ad364e35_6.0.6002.22402_none_a7b6e76c20ccc613.manifest
File versionNot applicable
File size24,286
Date (UTC)11-May-2010
Time (UTC)18:44
PlatformNot applicable

Additional file information for Windows Server 2008 R2

Additional files for all supported x64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameAmd64_95f806bf794c895a7f6e2f8d6203ba8a_31bf3856ad364e35_6.1.7600.20708_none_1c167d5c4c296281.manifest
File versionNot applicable
File size728
Date (UTC)07-May-2010
Time (UTC)20:04
PlatformNot applicable
File nameAmd64_microsoft-windows-t..localsessionmanager_31bf3856ad364e35_6.1.7600.20708_none_021ce1233d15b9f0.manifest
File versionNot applicable
File size27,057
Date (UTC)06-May-2010
Time (UTC)15:18
PlatformNot applicable
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Properties

Article ID: 982303 - Last Review: June 11, 2010 - Revision: 2.0
APPLIES TO
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 for Itanium-Based Systems
  • Windows Server 2008 Datacenter
  • Windows Server 2008 Enterprise
  • Windows Server 2008 R2 Standard
  • Windows Server 2008 Standard
Keywords: 
kbfix kbautohotfix kbHotfixServer kbsurveynew kbqfe kbexpertiseadvanced KB982303
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