I have an SBS 2003 server set up with a VPN
I can connect from 4 machines extrenally with no problems and can browse the network as expected. 2 of these machines are using DG834G Routers to connect, one is using an IPCOP firewall and the other is using a custom linux IPTABLES firewall.
The SBS 2003 machine is connected to the internet using a DG814 DSL Gateway with port 1723 forwarded to the SBS box.
I'm using the most up to date firmware on the DG814 (4.10) which claims to support VPN PPTP Passthru, however I can't find an option to enable / disable on the router itself, nor can i enable IP protocol 47, although I'm fairly sure this is working as the other 4 machines can connect with no problems.
On the 5th Machine I'm getting "error 721: the remote machine did not respond"
this machine is running XP Pro SP2, connected via a DG834G router.