https://techcrunch.com/2019/01/17/federal-https-domains-expire-government-shutdown/

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During the government shutdown, security experts noticed several federal websites were throwing back browser errors because the TLS certificate, which lights up your browser with “HTTPS” or flashes a padlock, on many domains had expired. And because so many federal workers have been sent home on unpaid leave — or worse, working without pay but trying to fill in for most of their furloughed department — expired certificates aren’t getting renewed.