The packets that are sent to the local computer are dropped after you establish a VPN connection by using a third-party VPN adapter on a Windows Vista-based computer

The packets that are sent to the local computer are dropped after you establish a VPN connection by using a third-party VPN adapter on a Windows Vista-based computer

Article ID : 935945
Last Review : August 29, 2007
Revision : 3.0
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SYMPTOMS

Consider the following scenario. You install a third-party virtual private network (VPN) adapter on a Windows Vista-based computer. Then, you establish a VPN connection by using the VPN adapter. In this scenario, the packets that are sent to the local computer are dropped. Therefore, some applications that use the VPN adapter have communication difficulties. Additionally, when other computers initiate connections, these connections may fail.

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CAUSE

An error occurs when Windows Vista and the VPN software configure the local routing table. An incorrect route may prevent identification of the packets as packets whose destination is the local computer. Therefore, the packets are dropped.

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RESOLUTION

Hotfix information

A supported hotfix is now 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 this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451 (http://go.microsoft.com/?linkid=6294451)

Note If additional issues occur or 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. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support (http://support.microsoft.com/contactus/?ws=support)

Prerequisites

No prerequisites are required.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Windows Vista, x86-based versions
File name File version File size Date Time Platform
Update.mum Not Applicable 1,993 11-Jun-2007 09:50 Not Applicable
X86_833707e603aea44780706c1629802ee6_31bf3856ad364e35_6.0.6000.20616_none_a82bfd7acf7c570e.manifest Not Applicable 694 11-Jun-2007 09:50 Not Applicable
X86_microsoft-windows-rasppp_31bf3856ad364e35_6.0.6000.20616_none_6b333f2d6bf94eaf.manifest Not Applicable 51,515 11-Jun-2007 09:51 Not Applicable
Rasppp.dll 6.0.6000.20616 254,976 09-Jun-2007 02:38 x86
Windows Vista, 64-bit versions
File name File version File size Date Time Platform
Amd64_833707e603aea44780706c1629802ee6_31bf3856ad364e35_6.0.6000.20616_none_044a98fe87d9c844.manifest Not Applicable 696 11-Jun-2007 09:50 Not Applicable
Amd64_e18980e7485829e1bc68bfae3a0009ce_31bf3856ad364e35_6.0.6000.20616_none_e42e6be07f9eadb1.manifest Not Applicable 698 11-Jun-2007 09:50 Not Applicable
Amd64_microsoft-windows-rasppp_31bf3856ad364e35_6.0.6000.20616_none_c751dab12456bfe5.manifest Not Applicable 51,557 11-Jun-2007 09:56 Not Applicable
Package_1_for_kb935945~31bf3856ad364e35~amd64~~6.0.1.0.mum Not Applicable 1,785 11-Jun-2007 09:50 Not Applicable
Package_2_for_kb935945~31bf3856ad364e35~amd64~~6.0.1.0.mum Not Applicable 2,004 11-Jun-2007 09:50 Not Applicable
Update.mum Not Applicable 1,909 11-Jun-2007 09:50 Not Applicable
Rasppp.dll 6.0.6000.20616 300,032 09-Jun-2007 03:44 x64

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STATUS

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

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MORE INFORMATION

To provide loopback connectivity and to handle incoming packets, the TCP/IP protocol requires a local IP address route. This route has a netmask of 255.255.255.255, and the route points to the local address object. In Windows Vista, this route is configured by the TCP/IP protocol. Other components should not configure the route.

However, when certain VPN adapters are installed, the Routing and Remote Access service may configure the local IP address route to point to an IP address other than the local computer address. Therefore, the TCP/IP protocol cannot configure the route to point to the local address object. In this situation, the local address is not recognized. Therefore, all incoming packets that are sent to the local address are dropped. For more information about the standard terminology that is used to describe Microsoft software updates, click the following article number to view the article in the Microsoft Knowledge Base:

824684 (/Feedback.aspx?kbNumber=824684/) Description of the standard terminology that is used to describe Microsoft software updates

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APPLIES TO
• Windows Vista Ultimate
• Windows Vista Home Premium
• Windows Vista Home Basic
• Windows Vista Enterprise
• Windows Vista Business
• Windows Vista Business 64-bit Edition
• Windows Vista Ultimate 64-bit Edition
• Windows Vista Home Premium 64-bit Edition
• Windows Vista Home Basic 64-bit Edition
• Windows Vista Enterprise 64-bit Edition

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Keywords: 
kbbug kbfix kbqfe kbpubtypekc kbexpertiseinter kbhotfixserver kbwinvistapostrtmfix KB935945

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Microsoft Knowledge Base Article

This article contents is Microsoft Copyrighted material.
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