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Updated June 13, 2016
This article explain the Authentication Traffic but No Agent rule.
This rule is triggered by Events sent from DHCP servers on Domain Controllers as Workstations or servers being authenticated, but there is no LEM agent installed on the server/workstation.
Basically it is LEM's way of letting you know that there is a problem with agent communication on a machine.
The rule should only be enabled after all your servers and workstations have agents installed.
Unless you have LEM Agents on ALL of your Windows machines, you should disable the rule.