Even I've got the same issue. I'm practicing the hortonworks partner courses HDP administration lab. I'm trying to add node2 and node3 using "Add hosts" under Hosts tab in ambari. In the "Confirm Hosts" Step it's failing. Can someone help. Here is the link for my question: https://community.hortonworks.com/questions/148076/failing-to-add-hosts-using-ambari-ui.html ... View more