Well, it is not yet clear whether the double connection is the origin or a
consequence of the issue. I think next step will be to enable some akka debug
in CSIT. In my local setup I changed the akka.conf as instructed:

    loglevel = "DEBUG"
    log-config-on-start = on
    actor {
      debug {
        autoreceive = on
        lifecycle = on
        unhandled = on
        fsm = on
      }
    }

But I do not see any DEBUG message in karaf.log if this is the place where akka
log is dumped, maybe I need to enable some DEBUG in the karaf logger itself,
any idea of what is missing?