How can I randomize the ephemeral TCP source port numbers the Red Hat Enterprise Linux kernel is assigning my application?

Solution Verified - Updated -


  • The kernel is occasionally re-issuing the same ephemeral TCP source port for new connections from our client side application.  The problem is that the previous connection from that source port hasn't been closed on the server side so the server is not acknowledging the new connection.  How can I get the kernel to randomize the ephemeral source port numbers it is choosing so it doesn't pick the same source port number?


  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

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