[Serialize/Unserialize] Probleme de variable

@session_start();
$ns = new netSoul();
$ns->configure("127.0.0.1", 6679, "robertledoux", "123456", "dtc");
$ns->connect();
$ns->write("Ca fonctionne comme sur des roulette :-)");
echo $ns->getUser()." : ".$ns->read(128)."<br/>";
$_SESSION['netsoul_11'] = serialize($ns);
$ns2 = unserialize($_SESSION['netsoul_11']);

//MARCHE PLUS ICI
$ns2->write("kikou"); //marche PAS
echo $ns2->getUser()." : ".$ns2->read(128)."<br/>";

class					netSoul
	{
		protected			$m_socket;
		protected			$m_ip;
		protected			$m_port;
		protected			$m_username;
		protected			$m_pasword;
		protected			$m_location;

function	configure($ip, $port, $user, $pass, $location)
		{
			$this->m_ip = $ip;
			$this->m_port = $port;
			$this->m_username = $user;
			$this->m_password = $pass;
			$this->m_location = $location;
		}
		
		function	connect()
		{
			$this->m_socket = pfsockopen ($this->m_ip, $this->m_port);
		}
		
		function	read($size)
		{
			if ($size == 0)
				return (@fgets($this->m_socket));
			else
				return (@fgets($this->m_socket, $size));
		}
		
		function	write($message)
		{
			fputs($this->m_socket, $message);
		}
}