Why You Need to Know Your Certificate Supply Chain

Last week, on Thursday 30 September, a root certificate from Let’s Encrypt expired. This is not uncommon in itself, but as the certificate had no update or alternative, it meant that all domains and subdomains running the certificate were suddenly no longer listed as SSL / TLS-secured. The result: thousands of web pages and applications failed and were unable to serve the content people requested. What went wrong? And what can organisations do to fix similar issues in the future?

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