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What happens if the Client crashes and never closes the connection? Or the server crashes before being able to send a ACK FIN packet. Are those cases implemented in software?

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    The TCP state machine has timeouts for this very situation. – Ricky Jul 7 at 12:06
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They are, yes. If hosts A and B have a connection, and the program on host B crashes, or the host B reboots to the same IP address, or its IP is taken over by a different system, then IP address B will send TCP RST responses upon receiving segments from host A. This will result in host A's connection failing with error connection reset by peer.

If host B goes down and doesn't reboot, and nothing else takes its place on that IP address, the TCP connection on host A will eventually time-out as Ricky mentioned.

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