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If I were you I would first try upgrading your Agent from 4.0.1180 to 4.0.1345 (includes patch1) because it improved some communications problem.
Then try to make a telnet connection from this machine to the epo server using your agent-2server port and see if you get an error.
You can also try to upgrade your ePO server to patch 4 as it was classified by critical by McAfee
Roger that, I'll download/install the updates and let you know. Thanks.