Alerts from an Agent installed on a Red Hat server, the HostName shows up in the body of the Alert as localhost.localdomain, even though the server is registered to the InTrust Server correctly.
The host's /etc/hosts file may be not be configured correctly.
Confirm the output of the "hostname -f" command returns the expected result from DNS.
If not, investigate the /etc/hosts file for possible configuration issue
Additional information regarding the /etc/hosts file can be found at the link below: