As subject says, upon update to latest build 8.x of ZA (can't provide the version right now) the Nortel VPN client (both 4.x and 6.x) no longer function.
eg you get:
Thu Mar 19 22:21:18 2009 | Isakmpd | F | Login Failure due to: Driver failure
Exiting or disabling zone alarm from starting (as well true vector service) has no effect, uninstall of ZA fixes Nortel VPN.
Nortel was functioning fine with 8.X ZA prior to latest update.
Operating System:Windows XP Pro
Product Name:ZoneAlarm Internet Security Suite