This is an option that will enable you to limit how much your service is exposed to attacks from the public network. The Firewall Network protects the IPs that are associated with a machine. You must therefore configure each IP separately; it is not possible to configure the server as a whole. You can enable and configure it manually from the Control Panel in the IP section, by clicking on the gear icon to the right of the relevant IPv4.
Networking Overview. Client-Server Model. Multiplayer Programming Quick Start. Launching and Testing Your Dedicated Server. The server-client model used by Unreal Engine represents network multiplayer games with one server acting as the host of the game, and players joining that game as clients. The true game state is moderated by the server, while each player controls their pawns remotely with an autonomous proxy.