Hi all, My installation of Amabari server fails at the Confirm Hosts step at the registration phase. I have 4 hosts I want to use for this cluster. Of the 4 hosts, hadoop02 to hadoop04 successfully complete the registration step. The failure comes at hadoop01 when it tries to complete registration. So the whole step of Confirm Hosts fails. Hadoop01 is the one I intend to use as the master, and that's where I'm running the GUI from on 8080. I'm using the 'root' user to ssh to all the hosts. I also tried using the 'hadoop' user to to ssh to all the hosts. I've verified that I can do that to all hosts (including hadoop01) by ssh'ing into each host as those users by hand. This is what I have in the logs when hadoop01 decides to fail: INFO:root:BootStrapping hosts ['hadoop01.example.com', 'hadoop02.example.com', 'hadoop03.example.com', 'hadoop04.example.com'] using /usr/lib/python2.6/site-packages/ambari_server cluster primary OS: redhat7 with user 'root' sshKey File /var/run/ambari-server/bootstrap/4/sshKey password File null using tmp dir /var/run/ambari-server/bootstrap/4 ambari: hadoop01.example.com; server_port: 8080; ambari version: 2.1.0; user_run_as: root INFO:root:Executing parallel bootstrap WARNING:root:Bootstrap at host hadoop01.example.com timed out and will be interrupted INFO:root:Finished parallel bootstrap 30 May 2016 18:43:12,461 INFO [pool-9-thread-1] BSHostStatusCollector:55 - Request directory /var/run/ambari-server/bootstrap/4 30 May 2016 18:43:12,461 INFO [pool-9-thread-1] BSHostStatusCollector:62 - HostList for polling on [hadoop01.example.com, hadoop02.example.com, hadoop03.example.com, hadoop04.example.com] 30 May 2016 18:43:12,909 INFO [pool-9-thread-1] BSHostStatusCollector:55 - Request directory /var/run/ambari-server/bootstrap/4 30 May 2016 18:43:12,910 INFO [pool-9-thread-1] BSHostStatusCollector:62 - HostList for polling on [hadoop01.example.com, hadoop02.example.com, hadoop03.example.com, hadoop04.example.com] Can I get some help in getting past this step? ... View more