title: Can't connect to Cassandra (All host(s) tried for query failed
body: <p>I am trying to setup Datastax OpsCenter.</p>
  
  <p>When I tried to run datastax-agent I get the following error:</p>
  
  <pre><code>Can't connect to Cassandra (All host(s) tried for query failed (tried:
  /X.X.X.X1:9042 (com.datastax.driver.core.exceptions.TransportException:
  [/X.X.X.X1:9042] Cannot connect), /X.X.X.X2:9042 
  (com.datastax.driver.core.exceptions.TransportException: 
  [/X.X.X.X2:9042] Cannot connect), /X.X.X.X3:9042 
  (com.datastax.driver.core.exceptions.TransportException: 
  [/X.X.X.X3:9042] Cannot connect), /X.X.X.X4:9042, /X.X.X.X5:9042, 
  /X.X.X.X6:9042 [only showing errors of first 3 hosts, use getErrors() 
  for more details])), retrying soon.
  </code></pre>
  
  <p>Please let me know if any other details are required.</p>