This message means that the ossec-remoted service is already running. If you are starting this service manually, for example with this command:
/var/ossec/bin/ossec-remoted -f
Do not start the OSSEC services individually. OSSEC services are only supported with the provided unmodified OSSEC init and systemd scripts. The OSSEC services should only be started and stopped using the following methods:
Systemd based systems:
To start OSSEC run this command as root:
service ossec-hids start
To stop OSSEC run this command as root:
service ossec-hids stop
Init based systems:
To start OSSEC run this command as root:
service ossec-hids start
To stop OSSEC run this command as root:
service ossec-hids stop