Ratchet onopen client not fire

Question

I am trying to implement Ratchet Socket Hello word on my local machine every things works perfectly but on vps centos server when i run server service with

ssh Command : php chat-server.php

it start Listening on port correctly(i can see on linux that port is Listening ) , but when i open "clint.html" page the method onopen never fire but server says

new client connected !

and after 2 minute it says

client disconnected

if i send message to client it will take 2 minutes then client will receive it, but it will disconnect again it seems to me that there is not stable connection between server and client. every time when i check websocket.readyState its not equal to 1
i disabled firewall and any security on vps server but still have this problem. i have to mention that normal php socket functions works without problem because i could test it and every thing works but about ratchet it seems it hang on onopen method.

• port 9091 is open
• firewall is disabled
• abrandao.com/2013/06/websockets-html5-php/ works whiteout problem and can send and receive message from clients

• BUT Ratchet has problem onconnect

  
  

  chat-server.php :

  use Ratchet\Server\IoServer;
  use Ratchet\Http\HttpServer;
  use Ratchet\WebSocket\WsServer;
  use MyApp\Chat;
  require dirname(__DIR__) . '/vendor/autoload.php';
  
  $server = IoServer::factory(
      new HttpServer(
          new WsServer(
              new Chat()
          )
      ),
      9091
  );
  echo date("Y-m-d H:i:s")." chat-server Started on port 9091 \n";
  $server->run();
  

  Chat.php class :

  namespace MyApp;
  use Ratchet\MessageComponentInterface;
  use Ratchet\ConnectionInterface;
  class Chat implements MessageComponentInterface {
  protected $clients;
  
  public function __construct() {
      $this->clients = new \SplObjectStorage;      
  }
  
  public function onOpen(ConnectionInterface $conn) {        
      $this->clients->attach($conn);
      echo date("Y-m-d H:i:s")." New connection! ({$conn->resourceId})\n";        
      $conn->send("Hello {$conn->resourceId} from server at : ".date("Y-m-d H:i:s"));
      echo date("Y-m-d H:i:s")." Hello Sent to  ({$conn->resourceId})\n"; 
  
  }
  
  public function onMessage(ConnectionInterface $from, $msg) {
      $numRecv = count($this->clients) - 1;
      echo sprintf(date("Y-m-d H:i:s").'Connection %d sending message "%s" to %d other connection%s' . "\n"
          , $from->resourceId, $msg, $numRecv, $numRecv == 1 ? '' : 's');
      foreach ($this->clients as $client) {
          if ($from !== $client) {                
              $client->send($msg);
          }
      }
  }
  
  public function onClose(ConnectionInterface $conn) {        
      $this->clients->detach($conn);
      echo date("Y-m-d H:i:s")." Connection {$conn->resourceId} has disconnected\n";
  }
  
  public function onError(ConnectionInterface $conn, \Exception $e) {
      echo date("Y-m-d H:i:s")." An error has occurred: {$e->getMessage()}\n";
      $conn->close();
  }
  }
  

  client html :
  

  $(document).ready(function(){  
     connect();  
  });
  
  var wsUri = "ws://myserverdomain.comOrIP:9091";   
  
  
   function connect() {
    var ws = new WebSocket(wsUri);
  
    ws.onopen = function() {
      var now = new Date();
      console.log(now + ' Connected to '+wsUri);        
    };
  
    ws.onmessage = function(e) {
        var now = new Date();
      console.log(now + ' Message Recived From Server :', e.data);
    };
  
    ws.onclose = function(e) {
        var now = new Date();
      console.log(now +' Socket is closed. Reconnect will be attempted in 1 second.', e.reason);
      setTimeout(function() {
        connect();
      }, 1000)
    };
  
    ws.onerror = function(err) {
        var now = new Date();
      console.error(now + ' Socket encountered error: ', err.message, 'Closing socket')
      console.error(err)
      ws.close()
    };
  }