cannot log in admin area after moveto new server

[Ajeh]

In the Admin I used for:
/admin/includes/functions/sessions.php

    function _sess_write($key, $val) {
      global $SESS_LIFE, $db;
      if (!is_object($db)) {
        //PHP 5.2.0 bug workaround ...
        $db = new queryFactory();
        $db->connect(DB_SERVER, DB_SERVER_USERNAME, DB_SERVER_PASSWORD, DB_DATABASE, USE_PCONNECT, false);
      }