Microsoft KB Archive/831357

= Point-to-Point Protocol connection fails when CHAP authentication and compulsory tunneling are used =

Article ID: 831357

Article Last Modified on 10/26/2006

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Professional Edition
 * Microsoft Windows 2000 Advanced Server

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SYMPTOMS
On a Microsoft Windows 2000-based computer, when you try to connect to a remote network (such as your Internet Service Provider) by using a Point-to-Point Protocol (PPP) connection (dial-up, PPP over Ethernet (PPoE), or virtual private network(VPN)), the connection fails because the authentication is not successful.



CAUSE
This problem may occur if both of the following conditions are true:
 * The network connection uses Layer Two Tunneling Protocol (L2TP) compulsory tunneling.
 * Your PPP connection is configured to use Challenge Handshake Authentication Protocol (CHAP) as the authentication method.



Hotfix Information
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

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

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites
No prerequisites are required.

Restart requirement
You must restart your 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) 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.

 Date         Time   Version        Size     File name -- 06-Nov-2003  00:31  5.0.2195.6871  198,928  Rasppp.dll



WORKAROUND
To work around this problem, do either of the following:
 * Use Password Authentication Protocol (PAP) as your authentication method.
 * Use Microsoft Windows XP instead of Windows 2000. This problem does not occur when you use Windows XP with a PPP connection that is configured to use CHAP authentication.



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



MORE INFORMATION
For additional information about compulsory tunneling as defined in RFC 2809, visit the following Web site:

http://www.faqs.org/rfcs/rfc2809.html

For additional information about how hotfix packages are named, click the following article number to view the article in the Microsoft Knowledge Base:

816915 New file naming schema for Microsoft Windows software update packages

For additional information, 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

Keywords: kbhotfixserver kbqfe kbbug kbfix kbqfe kbwin2000presp5fix KB831357

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