The reason for this is because of how DLP queries the server hostnames. With the hostname being listed under localhost it is listed as "localhost." When multiple servers are listed as "localhost" the agent gets confused about which to connect to and we see the issue where the agents do not show up in the UI correctly.
The preferred resolution is to create a separate entry for the hostname and the localhost on each RHEL Endpoint Server and recycle the monitor service. Example:
127.0.0.1 localhost localhost.localdomain
By doing this the server will be listed by its hostname, the agents will know where they are supposed to connect, and they should show up in the UI as expected.
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