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Line 1: A '''Half-open Connection''' refers to a [[Transmission Control Protocol\|TCP]] connection that is partially open. The TCP protocol has a three state system for opening a connection. First, the originating site (A) sends a [[SYN (TCP)\|SYN packet]] to the destination (B). A is now half-open, and awaiting a response. B now updates its kernel information to indicate the incoming connection from A, and sends out a request to open a channel back (the SYN/ACK packet). At this point, B is now "Half-open" (it has sufficient information to receive packets, but not enough to send packets back). Note that B was put into this state by another machine, outside of B's control.

TCP half-open: Difference between revisions