We are trying to have clients outside of the company firewall report to
the ZAM server on the inside. The ZAM server is positioned in the DMZ with
a public ip address. We have opened all TCP/IP ports (bi directional) to
the Server (as a test) and the clients still do not report. The clients
inside of the firewall all report fine.

If the remote clients connect via VPN, it reports to the server.
Is there any way to have them report without the VPN connection ?