@jsing You may well be correct that the server was incorrectly
configured, unfortunately it was a Windows server managed by a third
party and I don't know precisely how it was set up. Given that the cert
in question was issued on 9th September 2021 I suspect it was a
misconfiguration of their
I ran into an SSL verification issue today, caused by this change.
It seems that some older LetsEncrypt clients have still recently been
issuing valid certificates signed by the DST Root CA X3 root.
These certificates would have otherwise continued to work normally until
the root expired
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