This article describes an issue in which high CPU load occurs on a Windows Server 2012 R2-based server. Before you install this update, see the Prerequisites section.

Symptoms

Assume that a VPN client is connecting to a Routing and Remote Access service (RRAS) server that is behind a network address translation (NAT). When the VPN client loses connection accidentally and then reconnects, the VPN client gets a new IP address, and the previous connection disappears from the network without a complete VPN disconnection. In this situation, NAT keep-alive timer still sends previous keep-alive messages every 20 seconds to keep the NAT mappings active, and the CPU usage of the server becomes high. 

Cause

This issue occurs because NAT keep-alive timer isn't cleaned up when the VPN client gets a new IP address.

How to get this update

Important If you install a language pack after you install this update, you must reinstall this update. Therefore, we recommend that you install any language packs that you need before you install this update. For more information, see Add language packs to Windows.

Method 1: Windows Update

This update is provided as a Recommended update on Windows Update. For more information about how to run Windows Update, see How to get an update through Windows Update.

Method 2: Microsoft Download Center

The following files are available for download from the Microsoft Download Center:

Operating system

Update

All supported x86-based versions of Windows 8.1

Download Download the package now.

All supported x64-based versions of Windows 8.1

Download Download the package now.

All supported x64-based versions of Windows Server 2012 R2

Download Download the package now.

Note The update for Windows RT 8.1 can be got only from Windows Update.

For more information about how to download Microsoft support files, select the following article number to view the article in the Microsoft Knowledge Base:

119591 How to obtain Microsoft support files from online services Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

Update detail information

Prerequisites

To install this update, you should first install April 2014, update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 (2919355) in Windows 8.1 or Windows Server 2012 R2.

Registry information

To apply this update, you don't have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this update.

Update replacement information

This update doesn't replace a previously released update.

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.

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 0.17 xxx

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

    RTM

    GDR

    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

Bfe.dll

6.3.9600.18229

528,896

05-Feb-2016

15:12

Not applicable

Fwpuclnt.dll

6.3.9600.18229

246,784

05-Feb-2016

15:11

Not applicable

Ikeext.dll

6.3.9600.18229

634,880

05-Feb-2016

15:03

Not applicable

Nshwfp.dll

6.3.9600.18228

559,616

04-Feb-2016

16:06

Not applicable

Bfe.dll

6.3.9600.18229

528,896

05-Feb-2016

15:12

Not applicable

Fwpuclnt.dll

6.3.9600.18229

246,784

05-Feb-2016

15:11

Not applicable

Ikeext.dll

6.3.9600.18229

634,880

05-Feb-2016

15:03

Not applicable

Networksecurity-ppdlic.xrm-ms

Not applicable

3,059

05-Feb-2016

15:30

Not applicable

Nshwfp.dll

6.3.9600.18228

559,616

04-Feb-2016

16:06

Not applicable

Wfplwfs.sys

6.3.9600.17485

70,984

10-Nov-2014

17:52

Not applicable

x86 Windows 8.1

File name

File version

File size

Date

Time

Platform

Bfe.dll

6.3.9600.18229

570,368

05-Feb-2016

15:08

x86

Fwpuclnt.dll

6.3.9600.18229

272,384

05-Feb-2016

15:07

x86

Ikeext.dll

6.3.9600.18229

734,208

05-Feb-2016

14:56

x86

Nshwfp.dll

6.3.9600.18228

561,664

04-Feb-2016

16:22

x86

Bfe.dll

6.3.9600.18229

570,368

05-Feb-2016

15:08

x86

Fwpuclnt.dll

6.3.9600.18229

272,384

05-Feb-2016

15:07

x86

Ikeext.dll

6.3.9600.18229

734,208

05-Feb-2016

14:56

x86

Networksecurity-ppdlic.xrm-ms

Not applicable

3,059

05-Feb-2016

15:36

Not applicable

Nshwfp.dll

6.3.9600.18228

561,664

04-Feb-2016

16:22

x86

Wfplwfs.sys

6.3.9600.17485

69,440

10-Nov-2014

17:47

x86

x64 Windows 8.1 and Windows Server 2012 R2

File name

File version

File size

Date

Time

Platform

Bfe.dll

6.3.9600.18229

845,312

05-Feb-2016

15:11

x64

Fwpuclnt.dll

6.3.9600.18229

422,400

05-Feb-2016

15:11

x64

Ikeext.dll

6.3.9600.18229

1,083,904

05-Feb-2016

15:02

x64

Nshwfp.dll

6.3.9600.18228

713,216

04-Feb-2016

16:23

x64

Bfe.dll

6.3.9600.18229

845,312

05-Feb-2016

15:11

x64

Fwpuclnt.dll

6.3.9600.18229

422,400

05-Feb-2016

15:11

x64

Ikeext.dll

6.3.9600.18229

1,083,904

05-Feb-2016

15:02

x64

Networksecurity-ppdlic.xrm-ms

Not applicable

3,059

05-Feb-2016

15:35

Not applicable

Nshwfp.dll

6.3.9600.18228

713,216

04-Feb-2016

16:23

x64

Wfplwfs.sys

6.3.9600.17485

136,512

10-Nov-2014

18:06

x64

Fwpuclnt.dll

6.3.9600.18229

272,384

05-Feb-2016

15:07

x86

Nshwfp.dll

6.3.9600.18228

561,664

04-Feb-2016

16:22

x86


Windows RT 8.1

File property

Value

File name

Arm_06030ba2094d4e3880a809f332c110a4_31bf3856ad364e35_6.3.9600.18229_none_cf918f48efc94872.manifest

File version

Not applicable

File size

704

Date (UTC)

05-Feb-2016

Time (UTC)

19:37

Platform

Not applicable

File name

Arm_86b6f78703f673e99e8a1a16587234e6_31bf3856ad364e35_6.3.9600.18229_none_1104b4996f9afa1e.manifest

File version

Not applicable

File size

710

Date (UTC)

05-Feb-2016

Time (UTC)

19:37

Platform

Not applicable

File name

Arm_microsoft-windows-network-security-winpe_31bf3856ad364e35_6.3.9600.18229_none_7af10a1732415957.manifest

File version

Not applicable

File size

97,109

Date (UTC)

05-Feb-2016

Time (UTC)

15:30

Platform

Not applicable

File name

Arm_microsoft-windows-network-security_31bf3856ad364e35_6.3.9600.18229_none_620c584c45ec9935.manifest

File version

Not applicable

File size

95,227

Date (UTC)

05-Feb-2016

Time (UTC)

19:37

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

2,002

Date (UTC)

05-Feb-2016

Time (UTC)

19:37

Platform

Not applicable

x86 Windows 8.1

File property

Value

File name

Update.mum

File version

Not applicable

File size

2,002

Date (UTC)

05-Feb-2016

Time (UTC)

19:37

Platform

Not applicable

File name

X86_05633a17c10908bc1d92276696558784_31bf3856ad364e35_6.3.9600.18229_none_22e144ca87b9b404.manifest

File version

Not applicable

File size

710

Date (UTC)

05-Feb-2016

Time (UTC)

19:37

Platform

Not applicable

File name

X86_7cece3262d30559db773f93e7efe07fb_31bf3856ad364e35_6.3.9600.18229_none_a67578fdee85fd17.manifest

File version

Not applicable

File size

704

Date (UTC)

05-Feb-2016

Time (UTC)

19:37

Platform

Not applicable

File name

X86_microsoft-windows-network-security-winpe_31bf3856ad364e35_6.3.9600.18229_none_7aee97bf32443a91.manifest

File version

Not applicable

File size

97,109

Date (UTC)

05-Feb-2016

Time (UTC)

15:39

Platform

Not applicable

File name

X86_microsoft-windows-network-security_31bf3856ad364e35_6.3.9600.18229_none_6209e5f445ef7a6f.manifest

File version

Not applicable

File size

95,167

Date (UTC)

05-Feb-2016

Time (UTC)

19:41

Platform

Not applicable

x64 Windows 8.1 and Windows Server 2012 R2

File property

Value

File name

Amd64_4e238511c3fda86827a8b0d2c94901c2_31bf3856ad364e35_6.3.9600.18229_none_4d5a12ffd037b632.manifest

File version

Not applicable

File size

714

Date (UTC)

05-Feb-2016

Time (UTC)

19:37

Platform

Not applicable

File name

Amd64_6bebd9bb69fd64b3d8da6e7ef84d7396_31bf3856ad364e35_6.3.9600.18229_none_7ad2a663ecfd8974.manifest

File version

Not applicable

File size

708

Date (UTC)

05-Feb-2016

Time (UTC)

19:37

Platform

Not applicable

File name

Amd64_d8df0b7c5569dbe8811ceba64f11ce58_31bf3856ad364e35_6.3.9600.18229_none_c7f228ab6e26b9bf.manifest

File version

Not applicable

File size

708

Date (UTC)

05-Feb-2016

Time (UTC)

19:37

Platform

Not applicable

File name

Amd64_microsoft-windows-network-security-winpe_31bf3856ad364e35_6.3.9600.18229_none_d70d3342eaa1abc7.manifest

File version

Not applicable

File size

97,115

Date (UTC)

05-Feb-2016

Time (UTC)

15:48

Platform

Not applicable

File name

Amd64_microsoft-windows-network-security_31bf3856ad364e35_6.3.9600.18229_none_be288177fe4ceba5.manifest

File version

Not applicable

File size

95,173

Date (UTC)

05-Feb-2016

Time (UTC)

19:44

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

2,927

Date (UTC)

05-Feb-2016

Time (UTC)

19:37

Platform

Not applicable

File name

Wow64_microsoft-windows-network-security_31bf3856ad364e35_6.3.9600.18229_none_c87d2bca32adada0.manifest

File version

Not applicable

File size

19,282

Date (UTC)

05-Feb-2016

Time (UTC)

15:39

Platform

Not applicable


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