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Article ID: 2761551 - Last Review: December 11, 2012 - Revision: 2.0

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Symptoms

Consider the following scenario:
  • Several client computers are running Windows Vista or Windows Server 2008 in a Windows Server 2008-based domain environment. 
  • Not all the client computers have update 2560500 installed. 
  • You use the Server Message Block (SMB) Version 2 protocol in the network. For example, you connect some client computers to Windows Server 2008-based file servers by using the SMB Version 2 protocol.
  • A named pipe operation occurs on the client computers that use the SMB Version 2 protocol.
  • You turn on more than two client computers that do not have update 2560500 installed. Then, you try to log on to the client computers.  
In this scenario, it takes longer than expected to log on to the client computers. For example, it takes more than 15 minutes to log on to the client computers.

Cause

This issue occurs because the wrong Query Information is used for the SMB Version 2 protocol on computers that do not have update 2560500 installed. Therefore, the Query Information blocks the worker threads of the SMB Version 2 protocol on the server, and every request by the SMB Version 2 protocol is delayed for one second.

Resolution

Hotfix information

After you apply the following hotfix package on a Windows Vista-based or Windows Server 2008-based computer that has the File Server role installed, the default REG_DWORD value of the SrvMaxThreadsPerQueue registry entry is changed from 10 to 20. The SrvMaxThreadsPerQueue registry entry is located under the following registry subkey:
\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters
Notes
  • Windows Vista and Windows Server 2008 have hardcoded SMB Version 2 protocol limits for the value of the SrvMaxThreadsPerQueue registry entry. The default value is 10. The maximum value of the SrvMaxThreadsPerQueue registry entry is 65,535.
  • The value of the SrvMaxThreadsPerQueue registry entry determines the maximum number of threads that the server creates to service the processor queue. When the Receive Side Scaling (RSS) feature of the network interface works as expected, the server service maintains a separate queue of client requests for each processor on the computer.
  • After you apply this hotfix, you can increase value of the SrvMaxThreadsPerQueue registry entry to improve the performance of the file server. You must restart the server service after you change the value of the registry entry. Run the following commands to restart the server service:
    net stop server
    net start server

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 website:
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 Windows Vista Service Pack 2 (SP2) or Windows Server 2008 SP2. Additionally, you must have the File Server role installed.

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  (http://support.microsoft.com/kb/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  (http://support.microsoft.com/kb/968849/ ) How to obtain the latest service pack for Windows Server 2008

Registry information

To apply this hotfix, 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.
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.
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    VersionProductSR_LevelService branch
    6.0.600 2 . 22xxxWindows Vista and Windows Server 2008SP2LDR
  • 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 Vista and for Windows Server 2008" section. MUM files 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 Vista and of Windows Server 2008
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File nameFile versionFile sizeDateTimePlatform
Srvnet.sys6.0.6002.22944102,91205-Oct-201213:13x86
Srv2.sys6.0.6002.22944147,96805-Oct-201213:13x86
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For all supported x64-based versions of Windows Vista and of Windows Server 2008
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File nameFile versionFile sizeDateTimePlatform
Srvnet.sys6.0.6002.22944146,43205-Oct-201213:47x64
Srv2.sys6.0.6002.22944177,66405-Oct-201213:47x64
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For all supported IA-64-based versions of Windows Server 2008
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File nameFile versionFile sizeDateTimePlatform
Srvnet.sys6.0.6002.22944294,91205-Oct-201212:52IA-64
Srv2.sys6.0.6002.22944474,11205-Oct-201212:52IA-64
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Workaround

To work around this issue, use one of the following methods.

Method 1
Disable the SMB Version 2 protocol on the Windows Server 2008-based file server. To do this, follow these steps:
  1. Click Start
    Collapse this imageExpand this image
    start button
    , type regedit in the Start Search box, and then press ENTER.
  2. Locate and then click the following registry subkey:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters
  3. On the Edit menu, point to New, and then click DWORD Value.
  4. Type SMB2, and then press ENTER.
  5. On the Edit menu, click Modify.
  6. Type 0, and then click OK.
  7. Exit Registry Editor.
  8. Restart the computer.

Method 2
Disable the time-out threshold for the local cache update on the Windows Vista-based or Windows Server 2008-based client computer. To do this, follow these steps:
  1. Click Start
    Collapse this imageExpand this image
    start button
    , type regedit in the Start Search box, and then press ENTER.
  2. Locate the following registry subkey:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\LanmanWorkstation\Parameters
  3. Right-click FileInfoCacheLifetime, and then click Modify.
  4. Under Base, click Decimal, and then type a number that is smaller than the number that appears in the Value date box.
Notes
  • Type 0 to disable the time-out threshold for the local cache update.
  • The number of seconds that you type represents the time-out threshold for the local cache update.
  • The network traffic increases if you use Method 2.

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  (http://support.microsoft.com/kb/824684/ ) Description of the standard terminology that is used to describe Microsoft software updates

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
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File nameX86_59dad1863ad7f8e30499fb74ddfbc9e4_31bf3856ad364e35_6.0.6002.22944_none_49dcd17f83e5e405.manifest
File versionNot applicable
File size1,048
Date (UTC)05-Oct-2012
Time (UTC)20:28
PlatformNot applicable
File nameX86_a9e66c057853b2a4286982ec16ab32de_31bf3856ad364e35_6.0.6002.22944_none_6d2353d5f81b08a4.manifest
File versionNot applicable
File size716
Date (UTC)05-Oct-2012
Time (UTC)20:28
PlatformNot applicable
File nameX86_microsoft-windows-s..eadsperqueue-regkey_31bf3856ad364e35_6.0.6002.22944_none_c46c11e85bc74f03.manifest
File versionNot applicable
File size1,323
Date (UTC)05-Oct-2012
Time (UTC)15:12
PlatformNot applicable
File nameX86_microsoft-windows-smbserver-common_31bf3856ad364e35_6.0.6002.22944_none_061f13412687c172.manifest
File versionNot applicable
File size4,227
Date (UTC)05-Oct-2012
Time (UTC)15:17
PlatformNot applicable
File nameX86_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.0.6002.22944_none_dc357e7c0cdc5e81.manifest
File versionNot applicable
File size4,426
Date (UTC)05-Oct-2012
Time (UTC)15:13
PlatformNot applicable
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Additional files for all supported x64-based versions of Windows Vista and of Windows Server 2008
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File nameAmd64_870e562cbac5dbe43c181753294db52a_31bf3856ad364e35_6.0.6002.22944_none_9fa9b370723eda16.manifest
File versionNot applicable
File size1,054
Date (UTC)05-Oct-2012
Time (UTC)20:28
PlatformNot applicable
File nameAmd64_8ea52c4ba68c5706b78df4493cf39081_31bf3856ad364e35_6.0.6002.22944_none_749478de42e4ecbf.manifest
File versionNot applicable
File size720
Date (UTC)05-Oct-2012
Time (UTC)20:28
PlatformNot applicable
File nameAmd64_microsoft-windows-s..eadsperqueue-regkey_31bf3856ad364e35_6.0.6002.22944_none_208aad6c1424c039.manifest
File versionNot applicable
File size1,325
Date (UTC)05-Oct-2012
Time (UTC)15:59
PlatformNot applicable
File nameAmd64_microsoft-windows-smbserver-common_31bf3856ad364e35_6.0.6002.22944_none_623daec4dee532a8.manifest
File versionNot applicable
File size4,493
Date (UTC)05-Oct-2012
Time (UTC)16:05
PlatformNot applicable
File nameAmd64_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.0.6002.22944_none_385419ffc539cfb7.manifest
File versionNot applicable
File size4,688
Date (UTC)05-Oct-2012
Time (UTC)16:01
PlatformNot applicable
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Additional files for all supported IA-64-based versions of Windows Server 2008
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File nameIa64_b18491a7064d63af99bb5ba386a7aab3_31bf3856ad364e35_6.0.6002.22944_none_5959526fb9a68fcd.manifest
File versionNot applicable
File size718
Date (UTC)05-Oct-2012
Time (UTC)20:28
PlatformNot applicable
File nameIa64_ece3016fcc116db389d96ec241aae50d_31bf3856ad364e35_6.0.6002.22944_none_e84d64c1867965dd.manifest
File versionNot applicable
File size1,051
Date (UTC)05-Oct-2012
Time (UTC)20:28
PlatformNot applicable
File nameIa64_microsoft-windows-s..eadsperqueue-regkey_31bf3856ad364e35_6.0.6002.22944_none_c46db5de5bc557ff.manifest
File versionNot applicable
File size1,324
Date (UTC)05-Oct-2012
Time (UTC)14:42
PlatformNot applicable
File nameIa64_microsoft-windows-smbserver-common_31bf3856ad364e35_6.0.6002.22944_none_0620b7372685ca6e.manifest
File versionNot applicable
File size4,488
Date (UTC)05-Oct-2012
Time (UTC)14:45
PlatformNot applicable
File nameIa64_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.0.6002.22944_none_dc3722720cda677d.manifest
File versionNot applicable
File size4,683
Date (UTC)05-Oct-2012
Time (UTC)14:43
PlatformNot applicable
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Applies to
  • Windows Server 2008 Enterprise
  • Windows Server 2008 Enterprise without Hyper-V
  • Windows Server 2008 Datacenter
  • Windows Server 2008 Datacenter without Hyper-V
  • Windows Server 2008 for Itanium-Based Systems
  • Windows Server 2008 Foundation
  • Windows Server 2008 Standard
  • Windows Server 2008 Standard without Hyper-V
  • Windows Web Server 2008
  • Windows Vista Enterprise
  • Windows Vista Enterprise 64-bit Edition
  • Windows Vista Business
  • Windows Vista Business 64-bit Edition
  • Windows Vista Ultimate
  • Windows Vista Ultimate 64-bit Edition
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbfix kbsurveynew kbexpertiseadvanced KB2761551
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