Chrome has announced plans to deprecate Chromes trust in the Symantec certificate authority. This post outlines how site operators can determine if theyre affected by this deprecation, and if so, what needs to be done and by when. Site operators are strongly encouraged to make the necessary changes to their sites before the First Canary release for Chrome 66 and 70, and no later than the corresponding Beta release dates. Chrome 66 has already been released to the Canary and Dev channels, meaning affected sites are already impacting users of these Chrome channels. If affected sites do not replace their certificates by March 15, 2018, Chrome Beta users will begin experiencing failures.”]
Source: https://security.googleblog.com/2018/03/distrust-of-symantec-pki-immediate.html