1.删除默认的pdm root等密码为空的用户
2.根目录下 的 config.inc.php，打开修改：
$cfg['blowfish_secret'] = 'yetnet_j2cms';填写一个字符串
$cfg['servers'][$i]['controluser'] = 'root';//填
$cfg['servers'][$i]['controlpass'] = 'yourpassword';填
$cfg['servers'][$i]['allownopassword'] = false;修改成
$cfg['servers'][$i]['allownopassword'] = true;