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In a certificate chain, you have to include all certificates starting from the domain and up towards the root. This should work: cat mycert.crt SectigoRSADomainValidationSecureServerCA.crt USERTrustRSAAddTrustCA.crt > combined.pem The position of the certs in the chain is based on Sectigo docs: Domain Validation: USERTrust RSA Certification ...

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