- 2nd, the certificate chain may comprise a certificate that isn't valid at the time from the scan. This tends to happen possibly when the scan takes place ahead of one of several certificate's 'notBefore' dates, or just after on the list of certificate's 'notAfter' dates. This information can be https://ssl-certificate68047.eveowiki.com/438678/not_known_facts_about_ssl_certificate_stands_for