ช่วยด้วยครับ mysqlnd cannot connect to MySQL 4.1+ using old authentication

$host ="111.111.1.111";
$username = "11111adm";
$password = "f11111111@#$";
$db = "111111DB";
	
$con = mysql_connect($host,$username,$password) or die(mysql_error());
mysql_select_db($db) or die("เลือกฐานข้อมูลไม่ได้"); 
mysql_query("SET character_set_results=utf8"); 
mysql_query("SET collation_connection=utf8_general_ci"); 
mysql_query("SET NAMES 'utf8'");