Chrome's red-shield warning explained. Map each NET::ERR_CERT_* error code to its cause and fix - including the distrusted-legacy-root cause behind most current AUTHORITY_INVALID errors, and the separate risk of CA-side compliance revocations.
Two reasons Chrome and Brave throw NET::ERR_CERT_AUTHORITY_INVALID: distrusted legacy roots (SSL.com 2016, DigiCert G1, Entrust) - the live, current cause - and CA-side compliance revocations, illustrated by a mid-sized CA's forced revocation of 63,525 certificates in July 2026. CA-agnostic diagnostics and fix steps.
Your SSL certificate works in Firefox and Safari but Chrome and Brave throw NET::ERR_CERT_AUTHORITY_INVALID? The real cause is almost always a distrusted legacy root - plus a separate, growing risk of CA-side compliance revocations. What to ask your CA to reissue.
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