I've used the NLM you sent to me, and the rules are ok now. But I have
another issue with VPN... After some hours up, the VPN just start to deny
the users to login.
My authentication rule is opened to all users, all users can login to VPN. I
control the access on the traffic rules, and I have a rule that is opened
for all users too.
When this problem happen, just users with supervisor rights can login to
VPN. If I stop and then restart the VPN (using the stopvpn.ncf and
startvpn.ncf), the server abends few hours later. I have to reboot the
server to bring the VPN back to work.

Any ideas?