Perimeter-Server

The connection runs backward from what you’d guess # Most people’s first assumption about a box sitting in the DMZ is that your trusted, internal network reaches out to it — the secure side initiates, the exposed side listens. A Perimeter Server does the opposite. The core B2Bi engine sitting safely inside your network never opens a connection out into the DMZ at all. Instead, the Perimeter Server — the box actually facing partners and the internet — dials back in to the core engine and holds that connection open. Partner traffic lands on the DMZ box first, and only then gets forwarded inward over a channel the DMZ side itself established.