https://crt.sh/?q=48504E974C0DAC5B5CD476C8202274B24C8C7172 The R3 Let's Encrypt intermediate CA expired today Sep 29 19:21:40 2021 GMT. The R3 intermediate CA was issuing certs past the expiration date, so some browsers may report NET::ERR_CERT_DATE_INVALID for the websites now. I was able to for…

R3 Intermediate certificate has expired

Nummer378 September 30, 2021, 1:16pm 77

That is correct, linking a thread with more info about the topic:

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