A PPTP Client might fail to connect to a VPN Server on the Internet through an ISA Server 2006<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

If a third party router (doing NAT) is located between your ISA Server 2006 and the Internet, then a PPTP client (behind the ISA) might fail to establish a PPTP connection with a VPN server on