This article describes an issue that occurs when Microsoft Azure site-to-site VPN tunnels use Windows Server 2012 R2 Routing and Remote Access Service (RRAS). A hotfix is available to fix this issue. Before you install this hotfix, see the Prerequisites section.

Symptoms

Microsoft Azure site-to-site VPN tunnels stop receiving incoming traffic, and the tunnel becomes unidirectional.

For more information about the scenario when this issue occurs, go to the More Information section.

Hotfix information

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


A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that's described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there's a "Hotfix Download Available" section at the top of this Knowledge Base article. If this section doesn't appear, submit a request to Microsoft Customer Service and Support to get 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 don't 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 don't see your language, it's because a hotfix isn't available for that language.

Prerequisites

To apply this hotfix, install update 2919355 in Windows 8.1 or Windows Server 2012 R2.

Registry information

To use the hotfix in this package, you don't have to make any changes to the registry.

Restart requirement

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

Hotfix replacement information

This hotfix doesn't replace a previously released hotfix.

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.


  • 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 0.16 xxx

    Windows RT 8.1

    RTM

    GDR

    6.3.960 0.17xxx

    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 separately 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 aren't listed, are signed with a Microsoft digital signature.

Windows 8.1, Windows RT 8.1 and Windows Server 2012 R2

Windows RT 8.1

File name

File version

File size

Date

Time

Platform

Cis.scp

Not applicable

735

18-Jun-2013

15:05

Not applicable

Ndproxy.sys

6.3.9600.18034

51,200

20-Aug-2015

18:05

Not applicable

Pppmenu.scp

Not applicable

2,817

18-Jun-2013

15:05

Not applicable

Rasbase-ppdlic.xrm-ms

Not applicable

3,374

21-Aug-2015

15:20

Not applicable

Rascfg.dll

6.3.9600.18034

148,480

20-Aug-2015

17:08

Not applicable

Rasctrnm.h

Not applicable

1,820

18-Jun-2013

15:05

Not applicable

Rasdiag.dll

6.3.9600.16384

62,464

22-Aug-2013

02:45

Not applicable

Rasmxs.dll

6.3.9600.16384

31,232

22-Aug-2013

03:09

Not applicable

Rasser.dll

6.3.9600.16384

22,528

22-Aug-2013

03:09

Not applicable

Wanarp.sys

6.3.9600.18035

67,584

21-Aug-2015

14:18

Not applicable

x86 Windows 8.1

File name

File version

File size

Date

Time

Platform

Cis.scp

Not applicable

735

18-Jun-2013

12:33

Not applicable

Kmddsp.tsp

6.3.9600.17484

39,424

08-Nov-2014

03:13

Not applicable

Ndistapi.sys

6.3.9600.17484

20,480

08-Nov-2014

03:17

x86

Ndproxy.sys

6.3.9600.18034

51,200

20-Aug-2015

18:40

x86

Pppmenu.scp

Not applicable

2,817

18-Jun-2013

12:34

Not applicable

Rasbase-ppdlic.xrm-ms

Not applicable

3,374

21-Aug-2015

15:58

Not applicable

Rascfg.dll

6.3.9600.18034

164,864

20-Aug-2015

17:22

x86

Rasctrnm.h

Not applicable

1,820

18-Jun-2013

12:34

Not applicable

Rasdiag.dll

6.3.9600.17484

61,440

08-Nov-2014

02:48

x86

Rasmxs.dll

6.3.9600.17484

33,280

08-Nov-2014

03:13

x86

Rasser.dll

6.3.9600.17484

22,528

08-Nov-2014

03:13

x86

Wanarp.sys

6.3.9600.18035

66,048

21-Aug-2015

14:16

x86

x64 Windows 8.1 and Windows Server 2012 R2

File name

File version

File size

Date

Time

Platform

Cis.scp

Not applicable

735

18-Jun-2013

15:03

Not applicable

Kmddsp.tsp

6.3.9600.17484

48,128

08-Nov-2014

03:56

Not applicable

Ndistapi.sys

6.3.9600.17484

24,576

08-Nov-2014

04:00

x64

Ndproxy.sys

6.3.9600.18035

72,192

21-Aug-2015

18:14

x64

Pppmenu.scp

Not applicable

2,817

18-Jun-2013

15:03

Not applicable

Rasbase-ppdlic.xrm-ms

Not applicable

3,374

21-Aug-2015

19:35

Not applicable

Rascfg.dll

6.3.9600.18035

185,856

21-Aug-2015

16:38

x64

Rasctrnm.h

Not applicable

1,820

18-Jun-2013

15:03

Not applicable

Rasdiag.dll

6.3.9600.17484

77,824

08-Nov-2014

03:24

x64

Rasmxs.dll

6.3.9600.17484

43,008

08-Nov-2014

03:56

x64

Rasser.dll

6.3.9600.17484

30,208

08-Nov-2014

03:56

x64

Wanarp.sys

6.3.9600.18035

80,384

21-Aug-2015

18:13

x64

Cis.scp

Not applicable

735

18-Jun-2013

12:33

Not applicable

Kmddsp.tsp

6.3.9600.17484

39,424

08-Nov-2014

03:13

Not applicable

Pppmenu.scp

Not applicable

2,817

18-Jun-2013

12:34

Not applicable

Rascfg.dll

6.3.9600.18034

164,864

20-Aug-2015

17:22

x86

Rasctrnm.h

Not applicable

1,820

18-Jun-2013

12:34

Not applicable

Rasdiag.dll

6.3.9600.17484

61,440

08-Nov-2014

02:48

x86

Rasmxs.dll

6.3.9600.17484

33,280

08-Nov-2014

03:13

x86

Rasser.dll

6.3.9600.17484

22,528

08-Nov-2014

03:13

x86

Additional file information

Windows RT 8.1

File property

Value

File name

Arm_daa5e92636da216d379e7f1e3d0a073a_31bf3856ad364e35_6.3.9600.18035_none_88961441cd351bb0.manifest

File version

Not applicable

File size

695

Date (UTC)

22-Aug-2015

Time (UTC)

00:25

Platform

Not applicable

File name

Arm_microsoft-windows-rasbase_31bf3856ad364e35_6.3.9600.18035_none_a2b97b6495dcc28c.manifest

File version

Not applicable

File size

41,734

Date (UTC)

22-Aug-2015

Time (UTC)

00:25

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

1,794

Date (UTC)

22-Aug-2015

Time (UTC)

00:25

Platform

Not applicable

x86 Windows 8.1

File property

Value

File name

Update.mum

File version

Not applicable

File size

1,794

Date (UTC)

22-Aug-2015

Time (UTC)

00:25

Platform

Not applicable

File name

X86_7983f88aefc86f65cd3ef1f7402d192e_31bf3856ad364e35_6.3.9600.18035_none_5cc3b544714e94b5.manifest

File version

Not applicable

File size

695

Date (UTC)

22-Aug-2015

Time (UTC)

00:25

Platform

Not applicable

File name

X86_microsoft-windows-rasbase_31bf3856ad364e35_6.3.9600.18035_none_a2b7090c95dfa3c6.manifest

File version

Not applicable

File size

43,462

Date (UTC)

22-Aug-2015

Time (UTC)

00:28

Platform

Not applicable

x64 Windows 8.1 and Windows Server 2012 R2

File property

Value

File name

Amd64_0bafbbde892fff22365dfb77ea874cee_31bf3856ad364e35_6.3.9600.18035_none_1e31060cc8bdc201.manifest

File version

Not applicable

File size

699

Date (UTC)

22-Aug-2015

Time (UTC)

00:25

Platform

Not applicable

File name

Amd64_cef6834bd2f2c5c358822ccc635ffe71_31bf3856ad364e35_6.3.9600.18035_none_3483991b97fb8344.manifest

File version

Not applicable

File size

699

Date (UTC)

22-Aug-2015

Time (UTC)

00:25

Platform

Not applicable

File name

Amd64_microsoft-windows-rasbase_31bf3856ad364e35_6.3.9600.18035_none_fed5a4904e3d14fc.manifest

File version

Not applicable

File size

43,468

Date (UTC)

22-Aug-2015

Time (UTC)

00:32

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

2,960

Date (UTC)

22-Aug-2015

Time (UTC)

00:25

Platform

Not applicable

File name

Wow64_microsoft-windows-rasbase_31bf3856ad364e35_6.3.9600.18035_none_092a4ee2829dd6f7.manifest

File version

Not applicable

File size

30,583

Date (UTC)

22-Aug-2015

Time (UTC)

00:32

Platform

Not applicable

Status

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

References

See the terminology that Microsoft uses to describe software updates.

More Information

This issue occurs in the following scenario:

  • The site-to-site VPN connection is disconnected.

  • Before the disconnection is completed, a new connection is initiated by the traffic.

Because the RRAS server may hit a race condition, the routing table will end up in an inconsistent state, and TCP/IP will drop the incoming packets.  

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