Symptoms

Consider the following scenario:

  • You have a computer that is running Windows 8.1, Windows RT 8.1, Windows Server 2012 R2, Windows 7 Service Pack 1 (SP1), or Windows Server 2008 R2 SP1.

  • You have access-based enumeration enabled on a shared folder. Or you enable access-based enumeration on a DFS namespace on a folder.

  • You use the Server Message Block 2.0 file-sharing protocol. By default, this protocol is used on Windows-based computers.

  • You try to browse the contents of the shared folder. Or you try to do any other standard work that involves shared files.


In this scenario, CPU usage of the server seems to spike close to 100 percent, and you may experience performance issues such as delays.

Resolution

Hotfix information

A supported hotfix is available from Microsoft Support. 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, go to 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, install update 2919355 in Windows 8.1 or Windows Server 2012 R2. Or, install Service Pack 1 in Windows 7 or Windows Server 2008 R2.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any previously released hotfix.

Status

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

References

Learn about the terminology that Microsoft uses to describe software updates.

File Information

The English (United States) version of this software update installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). Be aware that dates and times for these files on your local computer are displayed in your local time and with your current daylight saving time bias. The dates and times may also change when you perform certain operations on the files.

Notes

  • 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 1.22 xxx

    Windows 7 or Windows Server 2008 R2

    SP1

    LDR

  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed in the "Additional file information" section. MUM, MANIFEST, and the associated security catalog (.cat) files, are very 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.

x86 Windows 7

File name

File version

File size

Date

Time

Platform

Srv2.sys

6.1.7601.22547

313,856

20-Dec-2013

01:00

x86

x64 Windows 7 and Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Srv2.sys

6.1.7601.22547

406,016

20-Dec-2013

01:16

x64

ia64 Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Srv2.sys

6.1.7601.22547

799,232

20-Dec-2013

00:41

IA-64


Notes

  • 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

    6.3.960 0.18 xxx

    Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2

    RTM

    GDR

  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed in the "Additional file information" section. MUM, MANIFEST, and the associated security catalog (.cat) files, are very 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.

Windows RT 8.1

File name

File version

File size

Date

Time

Platform

Srv2.sys

6.3.9600.18111

521,728

28-Oct-2015

16:24

Not applicable

x86 Windows 8.1

File name

File version

File size

Date

Time

Platform

Srv2.sys

6.3.9600.18111

562,688

28-Oct-2015

16:43

x86

x64 Windows 8.1 and Windows Server 2012 R2

File name

File version

File size

Date

Time

Platform

Srv2.sys

6.3.9600.18111

677,376

28-Oct-2015

17:35

x64


x86 Windows 7

File property

Value

File name

Update.mum

File version

Not applicable

File size

1,643

Date (UTC)

20-Dec-2013

Time (UTC)

06:51

Platform

Not applicable

File name

X86_36ebf8214e5828facbd0a32f76310226_31bf3856ad364e35_6.1.7601.22547_none_fd997073fc0a950c.manifest

File version

Not applicable

File size

700

Date (UTC)

20-Dec-2013

Time (UTC)

06:51

Platform

Not applicable

File name

X86_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.1.7601.22547_none_dc6018916df128ed.manifest

File version

Not applicable

File size

2,655

Date (UTC)

20-Dec-2013

Time (UTC)

02:37

Platform

Not applicable

x64 Windows 7 and Windows Server 2008 R2

File property

Value

File name

Amd64_63da24375a34d4d449457e3be5eb8da8_31bf3856ad364e35_6.1.7601.22547_none_82c1fdbb0205ba24.manifest

File version

Not applicable

File size

704

Date (UTC)

20-Dec-2013

Time (UTC)

06:51

Platform

Not applicable

File name

Amd64_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.1.7601.22547_none_387eb415264e9a23.manifest

File version

Not applicable

File size

2,657

Date (UTC)

20-Dec-2013

Time (UTC)

03:05

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

1,853

Date (UTC)

20-Dec-2013

Time (UTC)

06:51

Platform

Not applicable

ia64 Windows Server 2008 R2

File property

Value

File name

Ia64_b3b9e3293113963cec166f9ce7e43ccf_31bf3856ad364e35_6.1.7601.22547_none_6dde45114a195541.manifest

File version

Not applicable

File size

702

Date (UTC)

20-Dec-2013

Time (UTC)

06:50

Platform

Not applicable

File name

Ia64_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.1.7601.22547_none_dc61bc876def31e9.manifest

File version

Not applicable

File size

2,656

Date (UTC)

20-Dec-2013

Time (UTC)

02:24

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

1,447

Date (UTC)

20-Dec-2013

Time (UTC)

06:50

Platform

Not applicable

Windows RT 8.1

File property

Value

File name

Arm_a88b019c9d0b4e7397f7d2dac6086573_31bf3856ad364e35_6.3.9600.18111_none_c309bfe792bb9a85.manifest

File version

Not applicable

File size

700

Date (UTC)

29-Oct-2015

Time (UTC)

20:45

Platform

Not applicable

File name

Arm_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.3.9600.18111_none_6ed74d8811dc9122.manifest

File version

Not applicable

File size

259,944

Date (UTC)

28-Oct-2015

Time (UTC)

17:07

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

1,594

Date (UTC)

29-Oct-2015

Time (UTC)

20:45

Platform

Not applicable

x86 Windows 8.1

File property

Value

File name

Update.mum

File version

Not applicable

File size

1,594

Date (UTC)

29-Oct-2015

Time (UTC)

20:45

Platform

Not applicable

File name

X86_570b6e0e61bcd21a11508db9b66f5870_31bf3856ad364e35_6.3.9600.18111_none_e84f129369c487c3.manifest

File version

Not applicable

File size

700

Date (UTC)

29-Oct-2015

Time (UTC)

20:45

Platform

Not applicable

File name

X86_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.3.9600.18111_none_6ed4db3011df725c.manifest

File version

Not applicable

File size

259,944

Date (UTC)

28-Oct-2015

Time (UTC)

17:55

Platform

Not applicable

x64 Windows 8.1 and Windows Server 2012 R2

File property

Value

File name

Amd64_060d1586cd1fa3f95e159143d53cfee2_31bf3856ad364e35_6.3.9600.18111_none_5131c01efb3f6004.manifest

File version

Not applicable

File size

704

Date (UTC)

29-Oct-2015

Time (UTC)

20:45

Platform

Not applicable

File name

Amd64_microsoft-windows-smbserver-v2_31bf3856ad364e35_6.3.9600.18111_none_caf376b3ca3ce392.manifest

File version

Not applicable

File size

259,948

Date (UTC)

28-Oct-2015

Time (UTC)

18:49

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

1,602

Date (UTC)

29-Oct-2015

Time (UTC)

20:45

Platform

Not applicable


Need more help?

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

Was this information helpful?

What affected your experience?

Thank you for your feedback!

×