Think I found the problem, TLDR: firewalld (nodes running on centos7) was still running, when should be disabled on HDP clusters. From another community post: For Ambari to communicate during setup with the hosts it deploys to and manages, certain ports must be open and available. The easiest way to do this is to temporarily disable iptables, as follows: systemctl disable firewalld service firewalld stop So apparently iptables and firewalld need to be disabled across the cluster (supporting docs can be found here, I only disabled them on the Ambari installation node). After stopping these services across the cluster (I recommend using clush), was able to run the upload job without incident.
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