How TCP Graceful Close Works: The 4-Way Handshake

Your connection is established, but do you know how to end it without crashing your server? Most developers overlook TCP termination until their ports are exhausted or resources leak.

In this deep dive, we break down the TCP Connection Termination process, specifically focusing on why the protocol requires a four-way handshake to ensure data integrity.

Unlike the three-way establishment handshake, termination must account for TCP’s full-duplex nature, where both sides must independently close their send and receive channels.

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