gateway被堵塞了？

模拟客户端发起请求，当连接数为4115时 无法发起请求了 看了下 gateway被隐藏掉了 关掉客户端后又恢复正常 请问其中是有什么限制吗？

<?php
require __DIR__ . '/Autoloader.php';
use Workerman\Worker;
use Workerman\Lib\Timer;
use Workerman\Connection\AsyncTcpConnection;

$worker = new Worker();
$worker->onWorkerStart = 'connect';
function connect(){
    static $count = 0;
    // 2000个链接
    if ($count   >= 3000){
        sleep(5);
        $count = 0;
    }
    // 建立异步链接
    $con = new AsyncTcpConnection('ws://192.168.3.254:8001');
    $con->onConnect = function($con) {
       // 递归调用connect
       connect();
    };
    $con->onMessage = function($con, $msg) {
        echo "recv $msg\n";
    };
    $con->onClose = function($con) {
        echo "con close\n";
    };
    // 当前链接每10秒发个心跳包
    Timer::add(10, function()use($con){
        $con->send('{"type":"welcome","id":'.'fsdgrgergerg'.'}.'."\n");
    });
    $con->connect();
    echo $count, " connections complete\n";
}
Worker::runAll();