title: [Firestore][I-FST000001] Could not reach Firestore backend
body: <p>I have configured Firebase/Firestore, but Firestore return this error ever:</p>
  
  <blockquote>
    <p>[Firestore][I-FST000001] Could not reach Firestore backend.</p>
  </blockquote>
  
  <p>I'm using Swift 4 and Xcode 9. Any idea?</p>