Certificate Transparency required

The server's certificate is not logged in any Certificate Transparency log. Chrome requires CT logging for all publicly-trusted certificates issued after April 2018.

References

source.chromium.org/chromium/chromium/src/+/main:net/base/net_error_list.h
certificate.transparency.dev

In this namespace

← previous ERR_CERT_REVOKED Certificate revoked next → ERR_CONNECTION_ABORTED Connection aborted

ERR_CERT_AUTHORITY_INVALID ERR_CERT_COMMON_NAME_INVALID ERR_CERT_DATE_INVALID ERR_CERT_INVALID ERR_CERT_REVOKED ERR_CERTIFICATE_TRANSPARENCY_REQUIRED ERR_CONNECTION_ABORTED ERR_CONNECTION_CLOSED ERR_CONNECTION_FAILED ERR_CONNECTION_REFUSED ERR_CONNECTION_RESET