[vpn-help] BSOD after uninstalling Shrew with Novell Client installed

[Matthew Grooms]

On 4/29/2010 2:59 PM, Kevin Macnaughton wrote:
> Hi all,
>
> In my organization we use Novell with the Novell Client on Windows.
> After uninstalling Shrew VPN (2.1.5 or 2.1.6b7) on a Windows XP machine
> that has the Novell Client installed, the next time the machine is
> restarted, Windows will crash to a BSOD on startup. Shrew VPN uninstalls
> fine if the Novell Client has been removed first.
>
> The BSOD error: DRIVER_UNLOADED_WITHOUT_CANCELLING_PENDING_OPERATIONS
> The guilty file: vfilter.sys
>
> I had found this BSOD error in some other posts to this listserv, but
> they are related to the Deterministic Network Enhancer, which is not
> present on my machine.
>
> I also noticed that the vfilter.sys file gets left behind even during a
> successful uninstall (one that does not result in a BSOD on next boot),
> is that supposed to happen?
>
> To reproduce:
> Install Novell Client v4.91 SP5 and Shrew VPN 2.1.5 (or 2.1.6) in any
> order, then uninstall Shrew VPN and reboot.
>
> Pieces:
> Novell Client v4.91 SP5
> Shrew VPN 2.1.5
> Windows XP SP3
>

Hi Kevin,

I took a cursory look at this yesterday and I can definitely reproduce 
the crash. However, I'm not entirely sure of the root cause. I need to 
do more investigation and then I'll get back to you.

-Matthew