db connect has error!

object(PDOException)#2 (8) {
  ["message":protected]=>
  string(41) "SQLSTATE[HY000] [2002] Connection refused"
  ["string":"Exception":private]=>
  string(0) ""
  ["code":protected]=>
  int(2002)
  ["file":protected]=>
  string(57) "/data/www/wwwroot/ayhuangtazhenggu.com/__inc__/EasyDB.php"
  ["line":protected]=>
  int(37)
  ["trace":"Exception":private]=>
  array(5) {
    [0]=>
    array(6) {
      ["file"]=>
      string(57) "/data/www/wwwroot/ayhuangtazhenggu.com/__inc__/EasyDB.php"
      ["line"]=>
      int(37)
      ["function"]=>
      string(11) "__construct"
      ["class"]=>
      string(3) "PDO"
      ["type"]=>
      string(2) "->"
      ["args"]=>
      array(4) {
        [0]=>
        string(54) "mysql:host=127.0.0.1;port=3306;dbname=ayhuangtazhenggu"
        [1]=>
        string(16) "ayhuangtazhenggu"
        [2]=>
        string(16) "GjkzTSKchizf3B58"
        [3]=>
        array(1) {
          [1002]=>
          string(14) "SET NAMES utf8"
        }
      }
    }
    [1]=>
    array(6) {
      ["file"]=>
      string(76) "/data/www/wwwroot/ayhuangtazhenggu.com/web/act/config.php(2) : eval()'d code"
      ["line"]=>
      int(2)
      ["function"]=>
      string(11) "__construct"
      ["class"]=>
      string(6) "EasyDB"
      ["type"]=>
      string(2) "->"
      ["args"]=>
      array(1) {
        [0]=>
        &array(6) {
          ["host"]=>
          string(9) "127.0.0.1"
          ["port"]=>
          int(3306)
          ["username"]=>
          string(16) "ayhuangtazhenggu"
          ["password"]=>
          string(16) "GjkzTSKchizf3B58"
          ["dbname"]=>
          string(16) "ayhuangtazhenggu"
          ["charset"]=>
          string(4) "utf8"
        }
      }
    }
    [2]=>
    array(3) {
      ["file"]=>
      string(57) "/data/www/wwwroot/ayhuangtazhenggu.com/web/act/config.php"
      ["line"]=>
      int(2)
      ["function"]=>
      string(4) "eval"
    }
    [3]=>
    array(4) {
      ["file"]=>
      string(65) "/data/www/wwwroot/ayhuangtazhenggu.com/web.php(2) : eval()'d code"
      ["line"]=>
      int(2)
      ["args"]=>
      array(1) {
        [0]=>
        string(57) "/data/www/wwwroot/ayhuangtazhenggu.com/web/act/config.php"
      }
      ["function"]=>
      string(7) "include"
    }
    [4]=>
    array(3) {
      ["file"]=>
      string(46) "/data/www/wwwroot/ayhuangtazhenggu.com/web.php"
      ["line"]=>
      int(2)
      ["function"]=>
      string(4) "eval"
    }
  }
  ["previous":"Exception":private]=>
  NULL
  ["errorInfo"]=>
  NULL
}