We've been rolling out Vista company wide and have seen a multitude of cases where our users are connecting wirelessly to VPN and their laptops blue screen.
All laptops are HP 6910p with either 2 or 4 gigs of RAM.
All have SP1
All have Cisco Client 5.0.03.0530 or higher.
Most blue screens are happening over wireless, but we have had the occassional blue screen when they are connected with a net cable.
The only thing we've seen in common is IPv6 is enabled by default. Has anyone else seen this problem?