hsts (myblog) is a man in the middle attack preventer for tls. You specify a time and if the result differs web browsers view it then nags you about a problem that something is wrong.
One person reported it and so i checked it out and found nothing wrong with the server end. Until i discovered that the bios on the users crap hp thing was dated 1980.
The date was reset to 2016 and the problem disappeared. I never imagined that ssl would alert me to workstation problems. That’s not a compliant.