Two things that are missing from the description of the steps you have taken configuring 3200 are:
1. Definition of the gateway topology
2. NAT configuration for the network and server objects
Please check the "Networking/Topology" and define them as "External", "Internal"and "DMZ" with later two having appropriate networks behind interfaces.
Additionally, for objects representing hosts in DMZ, configure Static NAT parameters and for networks behind Internal, configure "Hide" NAT behind Gateway Object.
You may want to temporary enable ICMP in the Global Policy properties for troubleshooting and check logs for the NAT action, looking at XLate source and destination.
Regards,
Vladimir