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OCR: CIRCUIT CONNECTION GATEWAY Firewall Server Client 2 Connection Table 3 Firewall Connection Request Forwarded Request Connection Allowed Connection Figure 2 : The circuit connection gateway is used for circuit-oriented operations between a client and server. The client inside the firewall makes a request for a connection that the firewall verifies. If it is acceptable, the request is forwarded to the server outside the firewall. The circuit gateway can prevent initiation of connections in the other direction. or the gateway can be bidirectional.