@@ -81,6 +81,10 @@ func (n *networkRouter) postNetworkCreate(ctx context.Context, w http.ResponseWr

 		return err

 	}

+	if _, err := n.clusterProvider.GetNetwork(create.Name); err == nil {

+		return libnetwork.NetworkNameError(create.Name)

+	}

+

 	nw, err := n.backend.CreateNetwork(create)

 	if err != nil {

 		if _, ok := err.(libnetwork.ManagerRedirectError); !ok {

@@ -292,6 +292,10 @@ func (daemon *Daemon) UpdateContainerServiceConfig(containerName string, service

 	return nil

 }

+func errClusterNetworkConnect() error {

+	return fmt.Errorf("cannot connect or disconnect managed containers on a network")

+}

+

 // ConnectContainerToNetwork connects the given container to the given

 // network. If either cannot be found, an err is returned. If the

 // network cannot be set up, an err is returned.

@@ -300,6 +304,9 @@ func (daemon *Daemon) ConnectContainerToNetwork(containerName, networkName strin

 	if err != nil {

 		return err

 	}

+	if container.Managed {

+		return errClusterNetworkConnect()

+	}

 	return daemon.ConnectToNetwork(container, networkName, endpointConfig)

 }

@@ -313,6 +320,9 @@ func (daemon *Daemon) DisconnectContainerFromNetwork(containerName string, netwo

 		}

 		return err

 	}

+	if container.Managed {

+		return errClusterNetworkConnect()

+	}

 	return daemon.DisconnectFromNetwork(container, network, force)

 }