L2TP/IPSec certificate problem on Windows XP client

From: George Wu (george.wu@necsam.com)
Date: 03/17/03


Date: Sun, 16 Mar 2003 17:42:01 -0800
From: George Wu <george.wu@necsam.com>


We are unable to use a Windows XP VPN client to access a Windows 2000
VPN server. The problem (according to Event Viewer messages) is that
the client machine certificate does not have a private key associated
with it. This seems strange since the Certificates MMC snapin clearly
shows the machine certificate is valid and has a private key associated
with it. The client machine certificate was issued through automatic
enrollment. The same certificate setup has worked with other Windows
2000 and Windows XP client systems so it is not obvious what could be
causing the problem. In an attempt to fix this problem we have reissued
the client machine certificate multiple times with no luck. Any help
would be greatly appreciated.

In case it matters, the Windows XP client system has the following OS
patches:
   -> Service Pack 1a
   -> Hot Fix Q810883
   -> Hot Fix Q810577
   -> Hot Fix Q810565
   -> Hot Fix Q329441
   -> Hot Fix Q329170
   -> Hot Fix Q328310
   -> Hot Fix Q329834
   -> Hot Fix Q329390
   -> Hot Fix Q329115
   -> Hot Fix Q329048

GW



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