Anything changed for you in the last 6 hours? Both browser and command line show a valid cert for shelly-api-docs.shelly.cloud and shelly.cloud:
shelly-api-docs.shelly.cloud has address 91.92.139.35
$ openssl s_client -servername shelly-api-docs.shelly.cloud -connect shelly-api-docs.shelly.cloud:443 | openssl x509 -noout -text -certopt no_pubkey,no_sigdump,no_extensions,no_header,no_version,no_serial -ext subjectAltName
Signature Algorithm: sha256WithRSAEncryption
Issuer: C = GB, ST = Greater Manchester, L = Salford, O = Sectigo Limited, CN = Sectigo RSA Domain Validation Secure Server CA
Validity
Not Before: Nov 15 00:00:00 2021 GMT
Not After : Dec 15 23:59:59 2022 GMT
Subject: CN = *.shelly.cloud
X509v3 Subject Alternative Name:
DNS:*.shelly.cloud, DNS:shelly.cloud
-Jason
