Sorry, but I haven’t Windows Vista available to try to solve the issue. In any case, in the next release of Zeroshell I will update racoon and l2tp daemons.
Why do you not use OpenVPN for the host-to-LAN VPN connections? I know that there is the client for Windows Vista that works fine.
Zeroshell supports OpenVPN for Roadwarrios connections starting with the release 1.0.beta7.