I am trying to set up a VPN on my corporate network. In a 2003 environment we have used the Routing and Remote Access feature of 2003 server to set up a VPN. We have a Cisco 1841 Router and a Cisco ASA 5500 series firewall. I have configured the firewall to allow PPTP and GRE traffic, however, i am unsure what configuration i have to make to my router in order for this to work. Currently when we try to VPN into the network we are getting the infamous "721 error, remore comouter did not respond". Any advice?