title: AWS Cognito Hosted UI server IP address could not be found
body: <p>I've been trying to setup my Cognito User pool and the hosted UI sign-in webpage following the documentation from
  <a href="https://docs.aws.amazon.com/cognito/latest/developerguide/cognito-user-pools-app-integration.html" rel="noreferrer">https://docs.aws.amazon.com/cognito/latest/developerguide/cognito-user-pools-app-integration.html</a></p>
  
  <p>Followed the steps to the letter, but, it doesn't seem to work when I try to launch the sign-in webpage</p>
  
  <blockquote>
    <p>This site can’t be reached
    {myprefix}.auth.us-west-2.amazoncognito.com’s server IP address could
    not be found.</p>
  </blockquote>
  
  <p>I call it from the App integration -> App client settings -> Launch Hosted UI button, so no manipulation of the URL which looks something like <code>https://{myprefix}.auth.us-west-2.amazoncognito.com/login?client_id=&lt;some_client_id&gt;&amp;response_type=code&amp;scope=aws.cognito.signin.user.admin+email+openid+phone+profile&amp;redirect_uri=https://mybucket.s3-us-west-2.amazonaws.com/index.html</code></p>
  
  <p>Is there something that I'm missing?</p>