assert crash on windows server 2008 x64 when trying to send data on a REQ socket.

1) connect to REP socket (with a local REQ socket) (tcp://127.0.0.1:5555)
2) send data
3) Assert happens on this line:

int zmq::tcp_connecter_t::open ()
{
zmq_assert (s == retired_fd);
....

Some reason s is not closed correctly.