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Error: RCommand (Command not handled by receiver) - on Mac

I have two Macs both running macOS 10.12.6. One I cannect to with no problem (running Avast free software) and another (running full version of McAfee Total Protection that I cannot conntect to. In the log file I see this error:


2017/08/01 19:58:34.659  8320  2836 S0   SecureNetworkConnection::SendCallbackHandler(): [ i removed the id # in this section], Error: RCommand (Command not handled by receiver)


Has anyone heard of this before - I'm leaning on McAfee (I disabled the firewall but no connection).