Network.Disconnect

Description

Close all open connections and shuts down the network interface.

The timeout parameter indicates how much time in milliseconds the network interface gets to signal to others that it is disconnecting. The network state, like security and password, is also reset.

Note that if you set the timeout to 0 the network interface will shut down before the disconnect notification can be sent to the remote party. For a client this could mean they cannot reconnect to the server as the server thinks they are still connected (after a certain interval the connection will be detected as dropped).

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void OnGUI() {
        if (GUILayout.Button("Disconnect")) {
            Network.Disconnect();
            MasterServer.UnregisterHost();
        }
    }
}