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Reference.org
TCP half-open
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<p>The term half-open refers to <a href="/facts/Transmission_Control_Protocol/WW4sPrt9">TCP</a> connections whose state is out of synchronization between the two communicating hosts, possibly due to a crash of one side. A connection which is in the process of being established is also known as embryonic connection. The lack of synchronization could be due to <a href="/facts/SYN_flood/1NSf5QLz">malicious intent</a>. </p>