Please open a service request with Support portal and provide logs to further analyze it.
We are also facing the same problem on Solaris server version 5.10 having agent version 22.214.171.1240.
We have installed the solidcore on that server and system controller is showing as disconnected.We have uninstalled the agent & the installed again ,it shows as connected for a while but agent went to disconnected state.
I have rebooted the server & itis showing McAfee agent in system controller instead of disconnected.
We are monitoring it to check whether its for a time being or permanent