SSH handshake is not working when running the "heketi-cli topology load --json=/usr/share/heketi/topology.json command"

Issue

After Configuring heteki to manages GlusterFS 3.3 cluster.
Following steps 5.2 in the Red Hat Gluster Storage 3.3 Administration Guide.
Having pushed the SSH keys

Getting

# heketi-cli topology load --json=/usr/share/heketi/topology.json
Creating cluster ... ID: 95c6d6cee147811c0c38e78f77d9e263
        Allowing file volumes on cluster.
        Allowing block volumes on cluster.
        Creating node X.X.X.1 ... Unable to create node: New Node doesn't have glusterd running
        Creating node X.X.X.2 ... Unable to create node: New Node doesn't have glusterd running
        Creating node X.X.X.3 ... Unable to create node: New Node doesn't have glusterd running

Looking at /var/log/messages, I can see the following entries:

Apr 26 21:08:00 ol heketi: [cmdexec] WARNING 2018/04/26 21:08:00 Failed to create SSH connection to X.X.X.1:22: ssh: handshake failed: ssh: unable to authenticate, attempted methods [none publickey], no supported methods remain.