IP和端口是开放的，PHP仍然没有连接

我正在尝试通过外部远程IP连接到MikroTik RouterOS，但我无法连接，因为我可以看到我可以通过Localhost成功连接到API，但无法通过我所在站点的托管文件连接。。！

以下是文件链接：http://huntedhunter.com/router-api/examples/example1.php

此外，奇怪的是，8728端口在我的IP上是开放的，但它仍然没有连接。。。！

我正在使用此API连接：https://github.com/BenMenking/routeros-api

<pre>
<?php
require('../routeros_api.class.php');
$API = new RouterosAPI();
$API->debug = true;
if ($API->connect('39.33.4.164', 'test', 'test')) {

$ARRAY = $API->comm("/system/resource/print");

   $first = $ARRAY['0'];
$memperc = ($first['free-memory']/$first['total-memory']);
$hddperc = ($first['free-hdd-space']/$first['total-hdd-space']);
$mem = ($memperc*100);
$hdd = ($hddperc*100);
echo "Mikrotik RouterOs 4.16 Resources";
echo "<br />";
echo "<table width=550 border=0 align=center>";
echo "<tr><td>Platform, board name and Ros version is:</td><td>" . $first['platform'] . " - " . $first['board-name'] . " - "  . $first['version'] . " - " . $first['architecture-name'] . "</td></tr><br />";
echo "<tr><td>Cpu and available cores:</td><td>" . $first['cpu'] . " at " . $first['cpu-frequency'] . " Mhz with " . $first['cpu-count'] . " core(s) "  . "</td></tr><br />";
echo "<tr><td>Uptime is:</td><td>" . $first['uptime'] . " (hh/mm/ss)" . "</td></tr><br />";
echo "<tr><td>Cpu Load is:</td><td>" . $first['cpu-load'] . " %" . "</td></tr><br />";
echo "<tr><td>Total,free memory and memory % is:</td><td>" . $first['total-memory'] . "Kb - " . $first['free-memory'] . "Kb - " . number_format($mem,3) . "% </td></tr><br />";
echo "<tr><td>Total,free disk and disk % is:</td><td>" . $first['total-hdd-space'] . "Kb - " . $first['free-hdd-space'] . "Kb - " . number_format($hdd,3) . "% </td></tr><br />";
echo "<tr><td>Sectors (write,since reboot,bad blocks):</td><td>" . $first['write-sect-total'] . " - " . $first['write-sect-since-reboot'] . " - " . $first['bad-blocks'] . "% </td></tr><br />";
echo "</table>";
echo "<br />";
echo "<br />";
echo "<br />";
echo "<br />Debug:";
echo "<br />";
   $API->disconnect();
}
?>
</pre>