Ceph » rgw

the problem could be transient, and later connections may be successful after the load goes down.

to reproduce the issue you can set:

ulimit -n 128

code is here: https://github.com/ceph/ceph/blob/master/src/rgw/rgw_asio_frontend.cc#L570

void AsioFrontend::accept(Listener& l, boost::system::error_code ec)
{
  if (!l.acceptor.is_open()) {
    return;
  } else if (ec == boost::asio::error::operation_aborted) {
    return;
  } else if (ec) {
    throw ec;
  }