func getInboundHTTPConnectionManager(cd *configdump.Wrapper, port int32) (*hcm.HttpConnectionManager, error) {
	filter := istio_envoy_configdump.ListenerFilter{
		Port: uint32(port),
	}
	listeners, err := cd.GetListenerConfigDump()
	if err != nil {
		return nil, err
	}

	for _, l := range listeners.DynamicListeners {
		if l.ActiveState == nil {
			continue
		}