I too could not connect to my.f-secure.com using Chrome. I had allowed all cookies for that site in Win10, opened the Win10 firewall to that site, and added that site as an exception in Chrome. Seeing the message above, I used Firefox instead and was able to log in and extend my subscription. But after that, Firefox could no longer log in: "The connection to my.f-secure.com was interrupted while the page was loading. The page you are trying to view cannot be shown because the authenticity of the received data could not be verified." Please advise.
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