title: Auth0 stuck in callback
body: <p>Used auth0 for my react project and it works fine at my local. </p>
  
  <p>When i put my project to the server login page shows up, but after i try to login i get an error. 
  <code>http://localhost:3000/callback?code=ZSaQ96OshsFfpBUN&amp;state=q3KiPGbEPtIZ3UuSLd.KSbKjdXqk9-pD</code></p>
  
  <p>firefox says 
  <code>unable to connect - cant establish a connection to localhost:3000</code> and on </p>
  
  <p>chrome i got 
  <code>this site can't be reached - localhost refused to connect</code></p>
  
  <p>I tried different callback urls on the auth0 side but nothing changed. I do not know exactly what to do actually</p>