The opposite of client-side transparency (see "transparent"). A transparent connexion (TCP) or data stream (UDP) in which the firewall is transparent to the client. In other words, the client addresses the server directly, rather than indirectly through the firewall. Another way of putting it is that the true server, and not the gateway, is the target of the traffic. Typically used for outbound access. Outbound server-side transparency requires that the client's default route or gateway points to the IP address of the firewall's inside interface (or to a router whose default route gets there).