Symantec issued certs may not be trusted by Google and Mozilla so get ready for Browser warnings

Affect certs that use Symantec as their root of trust even if they were issued by an intermediate organization. For example, certificates handed out by Thawte, GeoTrust, and RapidSSL that rely on Symantec will be hit by Google's crackdown

The change will come in build 66 of Chrome – due for public release on April 17

Mozilla's Firefox will also distrust Symantec-issued certs from version 60 onwards, due out in May this year.

https://www.theregister.co.uk/2018/02/07/beware_the_coming_chrome_certificate_apocalypse/