If the agent to server secure port (443 by default) is disabled, MA 5.0 cannot communicate to the EPO server. To restore communication, you will need to re-enable SSL and redeploy the McAfee Agent. MA 5.0.1 will support non-SSL communication.
For further information, please refer to KB83200 (https://kc.mcafee.com/corporate/index?page=content&id=KB83200).
For more resources, visit the ServicePortal and search for related content. Also, visit the ePO community at https://community.mcafee.com/community/business/epo.
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