We are installing a Firewall Enterprise 8.3.2 into our existing network that has 3 GRE tunnels established between 2 Cisco routers. The Firewall will sit between the two routers. We have created Access Rules to allow GRE and PPTP. When we insert the firewall, the tunnels fail to establish between the two routers. We have checked the audit logs but don't even see the tunnels trying to establish.