title: Error connecting to Amazon EMR master node
body: <p>I created an EMR cluster on AWS and it generates my master DNS. I can see the status on the EMR cluster says <code>Waiting Cluster ready</code>. I've installed jupyter in this cluster and it is ready.</p>
  
  <p>I also set up the tunnels via putty and I can see the big EMR appears on the screen. </p>
  
  <p>I also use the foxyproxy and it is running.</p>
  
  <p>However, in the last step, when I open a web browser and type my master DNS followed by :8888, it just said <code>This site can't be reached: xxx.compute-1.amazonaws.com took too long to respond</code>.</p>
  
  <p>This really drives me crazy. I've tried it twice, I can set up the cluster and pay the money but cannot work on that. </p>