Charles-Francois Natali <neolo...@free.fr> added the comment: As explained by Jean-Paul, it's due to the fact that the closed TCP sockets spend some time in TIME-WAIT state before being deallocated. On Linux, this issue can be more or less worked-around using sysctl (net.ipv4.tcp_tw_{reuse,recycle}). There might be something similar on OS-X. It's definitely an OS-level tuning issue. Suggesting to close.
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