I ran into the following error when following these instructions: 2016-04-12 05:42:59,328 p=2472 u=gvetticaden | fatal: [obfuscated_ip]: UNREACHABLE! => {"changed": false, "msg": "SSH encountered an unknown error during the connection. We recommend you re-run the command using -vvvv, which will enable SSH debugging output to help diagnose the issue", "unreachable": true} To fix this issue, see the following thread: https://community.hortonworks.com/questions/24344/aws-unreachable-error-when-executing-metron-instal.html ... View more