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Showing posts from December, 2009

Cisco VPN with Windows 7 (ndis.sys BSOD)

After giving it much thought, I recently upgraded our first enduser to Windows 7. Having used Windows 7 (64-bit) for over a month with not many issues you can imagine my surprise when the user's laptop kept bluescreening after disconnecting from the VPN. On average it would bluescreen about 50% of the time just after I clicked disconnect. The error would report that ndis.sys was the root of the problem. After researching the issue online I could only find information on the more popular Cisco IPSec VPN client and not the Cisco AnyConnect client. Also, the issue they were facing was related to the computer going into a bluescreen cycle after installing the Cisco VPN client and rebooting. My laptop would reboot sucessfully and never have problems until I tried to use the VPN. I found several websites which gave workarounds, but no real solutions. Eventually I found an article that mentioned if you install a DNE update it would correct the problem. I try to not post anything on here

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