Microsoft KB Archive/841566

= You cannot establish a VPN connection by using a dial-up connection on a Windows XP-based computer =

Article ID: 841566

Article Last Modified on 8/29/2007

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APPLIES TO


 * Microsoft Windows XP Professional

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SYMPTOMS
Consider the following scenario:
 * You try to establish a virtual private network (VPN) connection by using a dial-up connection on a Microsoft Windows XP-based computer.
 * The Windows XP-based computer uses a Cisco VPN client.
 * The Windows XP-based computer uses a security solution that implements an intermediate driver by using a custom filter class. For example, the computer may use a security solution such as Senforce Enterprise Mobile Security Manager.

In this scenario, the VPN client cannot establish the connection and stops responding.



CAUSE
This problem occurs because the binding that connects the TCP/IP protocol, the Cisco VPN driver, and the dial-up networking stack (NDISWAN) is not handled correctly in this scenario.



Service pack information
To resolve this problem, obtain the latest service pack for Windows XP. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

322389 How to obtain the latest Windows XP service pack

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

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

Prerequisites
No prerequisites are required.

Restart requirement
You have to 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 tool in Control Panel.

Windows XP, Itanium-based versions


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



MORE INFORMATION
For more information about 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 Description of the standard terminology that is used to describe Microsoft software updates

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.

Keywords: kbqfe kbhotfixserver kbwinxpsp1fix kbbug kbfix kbpubtypekc KB841566

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