I have recently setup a windows 2003 server running ISA 2004. All of the publishing seems to be working perfectly, as well as email and normal Internet access from the internal network. Where I am having an issue, though, is the ability to establish a VPN connection via PPTP from a Windows XP workstation from behind the ISA Server to an external VPN Server. When I attempt to make the connection, I get an Error 619.
I'm assuming this is an ISA Server configuration issue. Does anyone know how to properly allow outbound PPTP access?