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The FIN_WAIT_2 state is somewhat unusual in that there is no timeout defined in the standard for it. This means that on many operating systems, a connection in the FIN_WAIT_2 state will stay around until the system is rebooted. If the system does not have a timeout and too many FIN_WAIT_2 connections build up, it can fill up the space allocated for storing information about the connections and crash the kernel. The connections in FIN_WAIT_2 do not tie up an httpd process.
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