Beginning with Chrome 56, certificates issued by WoSign and StartCom after October 21, 2016 00:00:00 UTC will not be trusted. Certificates issued before this date may continue to be trusted, for a time, if they comply with the Certificate Transparency in Chrome policy or are issued to a limited set of domains known to be customers of WoSign and StartCom.
Due to a number of technical limitations and concerns, Google Chrome is unable to trust all pre-existing certificates while ensuring our users are sufficiently protected from further misissuance. As a result of these changes, customers of WoSign and StartCom may find their certificates no longer work in Chrome 56.
https://security.googleblog.com/2016/10/distrusting-wosign-and-startcom.html
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