Not true. Port 443 is opened on the server site only. The outgoing port from the client will be an ephemeral port.
It is true, on the client side, if only for an ephemeral amount of time. I’ll agree that 443 is open only when browser communications take place then the port closes. However if you are having a shields up performed while your browser is communicating with GRC securely the possibility of a false positive exists.
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