![]() 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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