Comment 7 for bug 731878

From the concurrent thread (noting that 'haproxy' no longer works):

  http://marc.info/?l=linux-netdev&m=130176733401613&w=2 (2011-04-02, "tcp: disallow bind() to reuse addr/port regression in 2.6.38")

suggests a possible cause of:

  http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c191a836a908d1dd6b40c503741f91b914de3348