title: Spark Standalone: TransportRequestHandler: Error while invoking RpcHandler - when starting workers on different machine/VMs
body: <p>I am totally new at this, so please pardon for obvious mistakes if any.</p>
  
  <p>Exact errors:
  At Slave:
  INFO TransportClientFactory: Successfully created connection to /10.2.10.128:7077 after 69 ms (0 ms spent in bootstraps)
  WARN Worker: Failed to connect to master 10.2.10.128:7077</p>
  
  <p>At Master:
  INFO Master: I have been elected leader! New state: ALIVE
  ERROR TransportRequestHandler: Error while invoking RpcHandler#receive() on RPC id 7626954048526157749</p>
  
  <p>Little background &amp; Things I have tried/ taken care of:</p>
  
  <ul>
  <li>IMP: I have built from source code of spark</li>
  <li>Password free SSH</li>
  <li>Proper host-name addition to /etc/hosts</li>
  <li>Proper setup in spark-env.sh at master and slave (SPARK_MASTER_HOST, _PORT, CORES, INSTANCES etc)</li>
  <li>conf/slaves has proper slave host-name</li>
  <li>Tried turning off firewalls on both sides</li>
  <li>Checked connection between the 2 with proper port using 'nc'</li>
  <li>Re-ran build and tests</li>
  </ul>
  
  <p>Has anyone faced anything similar. Any help is appreciated, thank you.</p>