ช่วยด้วยครับ Warning: fsockopen() [function.fsockopen]: unable to connect to www.xxxxxxxx.com:80 (No route to host)

$fp = fsockopen($host,80);
         if (!$fp) {
            echo "<script> alert('socket error'); window.history.go(-1); </script>\n";
            exit();
         }
         fputs($fp, "POST $path HTTP/1.1\n");
         fputs($fp, "Host: $host\n");
         fputs($fp, "Referer: $referer\n");
         fputs($fp, "Content-type: application/x-www-form-urlencoded\n");
         fputs($fp, "Content-length: ".strlen($data_to_send)."\n");
         fputs($fp, "Connection: close\n\n");
         fputs($fp, "$data_to_send\n");
         while(!feof($fp)) {
             $res .= fgets($fp, 128);
         }
         fclose($fp);