Re: "server certificate verification failed"

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Author: Grzegorz Szymaszek
To: Stephane Ascoet
CC: dmo-discussion
Subject: Re: "server certificate verification failed"

ca-certificates in stretch and ascii is quite old and includes the
expired DST Root CA X3 certificate, which might be used to validate some
(all?) certificates from Let's Encrypt, including
Try disabling that certificate: see update-ca-certificates(8) and/or

Good luck!