Network.maxConnections
static var maxConnections: int;
static int maxConnections;
static maxConnections as int
Description

Set the maximum amount of connections/players allowed.

Setting it to 0 means no new connections can be made but the existing ones stay connected. Setting it to -1 means the maximum connections count is set to the same number of current open connections. In that case, if a players drops then the slot is still open for him. This cannot be set higher than the connection count given in Network.InitializeServer.
	function StartGameNow() {
		// Don't allow any more players
		Network.maxConnections = -1;
	}
using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void StartGameNow() {
        Network.maxConnections = -1;
    }
}
import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def StartGameNow() as void:
		Network.maxConnections = (-1)