I use AnyConnect to connect both XP and Vista clients to our company VPN. XP clients have no problem, but some Vista clients encountering issues. When they try to connect first time they get an error message "The VPN client driver has encountered an error" right after this comes "Unable to establish VPN". If they try again they get connected without any problems. This happens only the first time they try to connect.
Is there anything I can do to fix this? Any help will be appreciated.