When browsing your website that has an SSL certificate deployed in a Chrome browser, the message "NET::ERR_CERTIFICATE_TRANSPARENCY_REQUIRED" is displayed.
From November 2016, you may experience the "NET::ERR_CERTIFICATE_TRANSPARENCY_REQUIRED" error when using Google’s Chrome browser 53 and QQ browser 9.5.1 (with built-in Chrome 53 kernel) to visit HTTPS websites. This exception is caused by a bug in Chrome browser 53. To resolve this issue, use a Chrome browser version different to the 53 version.
For more information about this issue, see Chrome 53 Bug Affecting Symantec SSL/TLS Certificates.