I am trying to configure a Windows 2000 RRAS VPN server. I went through all the steps in the Microsoft article on how to set it up. I am able to connect to it through my lan, but all clients outside, accessing through the internet are not able to connect. I checked to see that port 1723 is open and it is. I am connected to the Internet through a Cisco 1720 router. Any ideas why I can't connect outside the office?