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In reply to Comment by Reader Stefan Richter

Andrew Ayer on 2020-06-01 at 20:19:

What version of macOS? If it's 10.11 or earlier, then it doesn't trust the new USERTrust RSA Certification Authority root. Apart from having your customer upgrade, there are two options:

1. Have your customer use Firefox, which uses its own trust store which includes USERTrust RSA Certification Authority.

2. Configure your server to send an additional intermediate certificate which is signed by the AAA Certificate Services root. Add the following certificate to the end of your existing certificate chain: https://api.certspotter.com/v1/certs/68B9C761219A5B1F0131784474665DB61BBDB109E00F05CA9F74244EE5F5F52B.pem

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