I've tried various things but I'm stumped on an aspect of this exercise.
When I try to setup the shared key on the client machine as per part 14 (/var/ossec/bin/agent-auth -m 172.16.215.129 -p 1515) I get the messages:
INFO: Connected to 172.16.215.129:1515
INFO: Using agent name as: secondary.example.com
INFO: Send request to manager. Waiting for reply.
INFO: Connection closed.
How would I resolve that?