![]() I had pointed this out in the blog post Sept. ![]() Clients that only know the old root certificates will not be able to verify Let's Encrypt server certificates after that. As of today, September 30, 2021, some root certificates used by Let's Encrypt to sign client certificates will lose their validity (expiration of Intermediate R3 on at 19:21:40 GMT – the DST Root CA X3 expires on 14:01:15 GMT).
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