I would check ulimit/top for number of open file handles (any leak over there) or memory consumption by any other process on the machine. @abhinav s ... View more

@Gerd Koenig anything in the Ambari Server log files you see? I'd suggest if you do not have any issues moving to Ambari 2.1.2.1 - it would be worth a try with that. ... View more

Yes you need to setup password less ssh - more info: http://docs.hortonworks.com/HDPDocuments/Ambari-2.1.2.0/bk_Installing_HDP_AMB/content/_set_up_password-less_ssh.html You can also setup Ambari agents manually - no password less ssh required: http://docs.hortonworks.com/HDPDocuments/Ambari-2.1.2.0/bk_ambari_reference_guide/content/ch_amb_ref_installing_ambari_agents_manually.html Hope that helps. ... View more