当我在我的电脑上测试这段代码时，一切正常，但是在prod中，上传到远程服务器的文件是空的。什么样的php/server配置会导致这个问题？

static function implicit_ftp($srcFile, $dstFile, $host, $port = 21, $username = null, $password = null, $acc = null)
    {
        $curlhandle = curl_init();
        curl_reset($curlhandle);
        curl_setopt($curlhandle, CURLOPT_URL, 'ftps://' . $host . '/' . $dstFile);
        curl_setopt($curlhandle, CURLOPT_USERPWD, $username . ':' . $password);
        curl_setopt($curlhandle, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($curlhandle, CURLOPT_PORT, $port);
        curl_setopt($curlhandle, CURLOPT_SSL_VERIFYHOST, FALSE);
        curl_setopt($curlhandle, CURLOPT_FTP_SSL, CURLFTPSSL_TRY);
        curl_setopt($curlhandle, CURLOPT_FTPSSLAUTH, CURLFTPAUTH_TLS);

        $fp = fopen($srcFile, 'r');
        curl_setopt($curlhandle, CURLOPT_UPLOAD, 1);
        curl_setopt($curlhandle, CURLOPT_INFILESIZE, filesize($srcFile));
        curl_setopt($curlhandle, CURLOPT_INFILE, $fp);

        curl_exec($curlhandle);
        $err = curl_error($curlhandle);
    }