I've got SBS2003, VPN enabled, VPN connection works from LAN.
Firebox X500 firewall and I've setup the following rules
tcp 1723 enabled and allowed NAT from external to internal IP address of server
tcp 1723 and ip 47 enabled and allowed any to internal IP of server
udp 500, udp 4500 and ip 50 for ipsec is enabled and allowed from any to internal ip of server
when i VPN from the wan it starts to connect sits at verifing username and password, then errors out and never connects. Problem has got to be on the firebox, not sure whatelse I need to configure.