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Cisco VPN Client 4.0.3 Fault

Posted on 2004-08-03
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Last Modified: 2008-01-09
Win2K Pro with all security patches applied.

The problem may be caused by the security patch ( KB867801) I applied on 7/31, but the problem manifests itself in Cisco VPN Client (V4.0.3), so I'm posting here.

1) Prior to 7/31 I had no problems using Cicso VPN Client
2) On 7/31 I applied Security patch KB867801
3) On 7/31 I upgraded Sygate Pro firewall
4a) On 8/2 I attempted to connect via Cisco VPN Client. (Only other app runnung is Web-browser [Mozilla]) The attempt failed at the last stage in the process (Securing Communications Channel) because the Peer refused the connection for an Unknown Reason.
4b) I again attempted to make the connection and got an immediate BSOD. (My system is configured to NOT automatically re-boot on BSOD's, but 9 times out of 10 this particular BSOD IS automatically rebooting). Assuming it's the same STOP each time, when the system doesn't automatically re-boot the BSOD is Stop 7F (x8,0,0,0) UNEXPECTED_KERNEL_MODE_TRAP.
5) I repeated step 4a a number of times while on the phone with my client. They monitored my attempts and saw no reason for the refused connection.
6a) Forgetting I had applied the security patch, I thought the only thing on my system that changed was the Firewall update.
6b) On 8/3 I disabled Sysgate Pro and installed ZoneAlarm Pro
7) Attempting to connect via the VPN Client, I now get the BSOD as soon as it gets to Secure Communications Channel.
8) I realized I also applied the Security patch, which can't be uninstalled, and now think that the patch may be the ultimate cause of the problem.
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Question by:LSilver
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Expert Comment

by:grblades
ID: 11707941
Hi LSilver,
I have had problems with the Cisco client and Zone Alarm in the past. Installing the client when zone alarm was installed caused networking problems and Outlook would not connect to our mail server. Removing zone alarm fixed the problem.

I suggest you deinstall the cisco client and all software firewalls and reset the tcpip stack using instructions in this article:-
http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q299357&
Then reinstall the cisco client and try again.
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Author Comment

by:LSilver
ID: 11708122
grblades:

Thanks for the suggestion.

Note that the problem originally occurred with Sygate Pro, so it's not Zone Alarm specific.

Also, with MS's assistance, I was able to remove KB867801. Foolish me, I looked under Windows 2000 HotFixes instead of Internet Explorer in Add/Remove programs. IAE, removing that patch did NOT fix the problem. MS has been sent both a Kernel and MiniDump.
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Author Comment

by:LSilver
ID: 11720150
The answer is the the problem was with Sygate Pro Build 2637. The Sygate folks gave me access to non-public Build 2709 which works just fine.
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