无法与邮件服务器 PHP PEAR 连接

我从早上开始就一直在尝试这个。一个多月来，我的PHP Pear邮件工作正常，但突然停止了，我不明白这个问题。会是什么？

    $mail=$mail_object->send($recipients, $headers, $mailmsg);
    if (PEAR::isError($mail)) {
        echo("<p>" . $mail->getMessage() . "</p>");
    } 
    else 
    {
        echo("<p>Message successfully sent!</p>");
    }

它正在给出此错误。

    Failed to connect to mail.escener.com:25 [SMTP: Failed to connect socket: An attempt was made to access a socket in a way forbidden by its access permissions. (code: -1, response: )]

上面的代码是绝对正确的，所以我还没有发布完整的代码。请指教。