Internal FSCTL requests are sent as IOCTL requests on a SMB connection during the synchronization of offline files in the CSC folder on a computer that is running Windows 7 SP1 or Windows Server 2008 R2 SP1

Symptoms

Consider the following scenario:

  • You use client-side caching (CSC) on a computer that is running Windows 7 Service Pack 1 (SP1) or Windows Server 2008 R2 SP1.

  • You make some changes to documents in the CSC folder when the folder is offline.

  • You set the folder to online mode to synchronize the changes with the server.

In this scenario, many unnecessary IOCTL requests are sent instead of FSCTL packages on the Server Message Block (SMB) connection. Additionally, many SMB2:C IOCTL (0xb) packages together with CtlCode: 0x000901AF messages are detected in the network connection.  For example, the following message is detected:

14515 9:40:03 AM 6/19/2012 09:40:03.6856025 System Client1.corp.company.net server1.corp.company.net SMB2 SMB2:C IOCTL (0xb), FID=0xFD

CtlCode: 0x000901AF - Unknown File System Control Code

Note This issue decreases the performance of file server and SMB2 responses. For example, SMB2:C QUERY DIRECTORY (0xe) requests might be delayed by up to 40 seconds.

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 website:

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, you must be running Windows 7 Service Pack 1 (SP1) or Windows Server 2008 R2 Service Pack 1 (SP1). For more information about how to obtain a Windows 7 or Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

976932 Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

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 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 files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version

    Product

    Milestone

    Service branch

    6.1.760
    1.22xxx

    Windows 7 and Windows Server 2008 R2

    SP1

    LDR

  • 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 7 and for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical 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

File name

File version

File size

Date

Time

Platform

Cscsvc.dll

6.1.7601.22079

549,888

06-Aug-2012

16:58

x86

Microsoft-windows-offlinefiles.mof

Not applicable

1,776

13-Jul-2009

20:25

Not applicable

For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Cscsvc.dll

6.1.7601.22079

696,832

06-Aug-2012

17:56

x64

Microsoft-windows-offlinefiles.mof

Not applicable

1,776

13-Jul-2009

20:20

Not applicable

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 about Offline Files and Folder Redirection, go to the following Microsoft website:

General information about Offline Files and Folder Redirection

Additional file information

Additional file information for Windows 7 and for Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows 7

File name

X86_2feae8d05882800b364aee072b2a0082_31bf3856ad364e35_6.1.7601.22079_none_0df906ae4c852746.manifest

File version

Not applicable

File size

708

Date (UTC)

07-Aug-2012

Time (UTC)

09:38

Platform

Not applicable

File name

X86_microsoft-windows-offlinefiles-service_31bf3856ad364e35_6.1.7601.22079_none_0c28987ed8ec4e5f.manifest

File version

Not applicable

File size

56,703

Date (UTC)

06-Aug-2012

Time (UTC)

17:33

Platform

Not applicable

Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

Amd64_19c1985a792c280b2b3c775d39845bbb_31bf3856ad364e35_6.1.7601.22079_none_34c910ffd4aff75a.manifest

File version

Not applicable

File size

712

Date (UTC)

07-Aug-2012

Time (UTC)

09:38

Platform

Not applicable

File name

Amd64_microsoft-windows-offlinefiles-service_31bf3856ad364e35_6.1.7601.22079_none_684734029149bf95.manifest

File version

Not applicable

File size

56,710

Date (UTC)

06-Aug-2012

Time (UTC)

18:47

Platform

Not applicable

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