The MOM is configured with only the FQDN for the collectors:
introscope.enterprisemanager.clustering.login.em1.port=5001 introscope.enterprisemanager.clustering.login.em1.publickey=config/internal/server/EM.public i
But when an Agent connects to the MOM, a list containing the Node Name (Short Name) and the FQDN is returned.
Why is this being returned? How do we configure to only return FQDN of collector?
By default, every EM in the cluster will enumerate and found all alias of its local network address. So the list we see in the log is expected. If any of the enumerated addresses in the list does not work for whatever reason, Agent will just move on to next address in the list, so it will all work out.