Under what conditions can a socket be moved out of ESTABLISHED state?

Solution Verified - Updated -

Issue

  • A system, such as a webserver or database server has a large number of ESTABLISHED connections such as these three examples:
# netstat | grep ESTAB
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
tcp        0      0 unused:37926            vc-in-f103.1e100.:https ESTABLISHED
tcp        0      0 unused:47582            google.com:http ESTABLISHED
tcp        0      0 unused:40607            qc-in-f125.:xmpp-client ESTABLISHED
  • Under what conditions can an ESTABLISHED socket be closed?

Environment

  • Red Hat Enterprise Linux 4
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6

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