I am trying to use PPTP, but something is blocking it. The W2K advanced server (Machine A) is setup on an internal network as 192.168.1.4 and also on the internet through XO. I can connect to A from B (internal LAN address 192.168.1.21), by using the 192.168.1.4. Machine C is a dialup account to the internet. Our Router is managed by XO. They have routed both UDP and TCP for port 1723. I have a cisco 1720 series router. I can connect through Terminal Server from C to A, but I cannot connect the VPN from C to A. I have never setup PPTP before, so perhaps you can tell me where to start looking.