Many websites experienced issues this week following the expiration of a root certificate provided by Let’s Encrypt, a free and open certificate authority (CA) used by millions of sites.
Let’s Encrypt, which is part of the nonprofit Internet Security Research Group (ISRG), is a massive provider of HTTPS certificates: Last February, it issued its billionth certificate and announced it was serving nearly 192 million websites.
The expiry of IdenTrust DST Root CA X3 happened on Sept. 30; after this, computers, devices, and clients like Web browsers will no longer trust certificates that have been issued by this CA.
“If the root certificate that your certificate chain anchors on is expired then there’s a good chance it’s going to cause things to fail,” writes Scott Helme, founder of Security Header, in a Sept. 20 blog post warning of the issue. This happened last May, he added, when the AddTrust External CA Root expired and caused problems for Roku, Stripe, and
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