In the last year alone, Let’s Encrypt have grown their market share quite a lot and as a CA becomes larger, it’s certificates enable more of the Web to operate and as a result, when something like this comes along they have the potential to cause more problems. The reason we’re having a problem at all is because clients don’t get updated regularly and if the client doesn’t get updated, then the new root CA that replaces the old, expiring root CA is not downloaded onto the device. In normal circumstances this event, a root CA expiring, wouldn’t even be worth talking about because the transition from an old root certificate to a new root certificate is completely transparent.
You may or may not need to do anything about this Root CA expiring, but I’m betting a few things will probably break on that day so here’s what you need to know! On 30th September 2021, the root certificate that Let’s Encrypt are currently using, the IdentTrust DST Root CA X3 certificate, will expire.
Some Web Sites Will Stop Working With El Capitan and Older
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