Upcoming releases of Google Chrome in March and September 2018 will no longer trust certain Symantec, Thawte, GeoTrust, and RapidSSL SSL/TLS certificates. Chrome users will see “Not secure” in the address bar when connecting to websites using a distrusted certificate.
Chrome 66 is ending support for Symantec certificates issued before June 1, 2016 on the following schedule:
The ‘Canary’ release already ended support for these certificates. It was released on January 20th, 2018.
The Beta release for Chrome 66 will be released on March 15th.
The Stable release for Chrome 66 will be released on April 17th.
If you are running a Symantec certificate issued before June 1, 2016, and you do not replace that certificate, then from April 17th onwards this is what your site will look like to site visitors:
As you can see, the error is described as NET::ERR_CERT_SYMANTEC_LEGACY, meaning that your site is using a legacy Symantec certificate that is no longer supported.
To check if your certificate will be affected by this change, you can visit this page: https://www.websecurity.symantec.com/support/ssl-checker.
We encourage our users to get SSL certificates at 1-year intervals as the speed of the internet is ever changing. If you need to renew a paid SSL certificate, please go here to get one issued ASAP: https://my.mightweb.net/index.php?rp=/store/ssl-certificates