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Mar 10, 2025 · Fundamentals

When the Third TCP Handshake Fails: Timeout, SYN Flood & Backend Lessons

The article explains the TCP three‑way handshake, why the third ACK is essential, how servers react when it is missing, the role of timeout retransmission and RTO calculation, the impact of SYN‑Flood attacks, and how these concepts inspire backend design patterns.