title: FCM some times got connection port 443 failed error
body: <p>I'm using FCM push notifications for messaging everything woks fine but sometimes when I want to send push notification to someone I got </p>
  
  <pre><code>Curl failed: Failed to connect to fcm.googleapis.com port 443: Connection timed out
  </code></pre>
  
  <p>I have searched almost everything. here appears similar issue, but my port is open
  <a href="https://stackoverflow.com/questions/24018433/sending-notification-message-to-android-device-curl-error">Sending notification message to android device curl error</a></p>
  
  <p>also my network is not under the proxy.</p>
  
  <p>Is it possible that the issue were causing from frequently calling of  firebase send notification? Does it have some restrictions?</p>