title: Facebook Messenger bot blocking server requests
body: <p>So, I decided to move my PHP back-end to another server. The old server works just fine. I changed facebook settings, so that the webhooks point to the new server. The server receives messages just fine, webhooks work well, but it can't send the messages back.</p>
  
  <p>CURL shows the following error:</p>
  
  <pre><code>*   Trying 157.240.1.18...
  * TCP_NODELAY set
  * Immediate connect fail for 157.240.1.18: Permission denied
  * Closing connection 0
  </code></pre>
  
  <p>I have absolutely no idea why permission would be denied. I'm using correct tokents etc and I didn't use any blacklisting features.</p>