In most cases, Alibaba Cloud CDN automatically renews individual test certificates (free) four days before expiration. However, renewal applications submitted to certificate authorities (CAs) can fail. To prevent HTTPS interruptions, upgrade to a paid certificate before the free certificate expires.
Options
Option 1 (recommended): Upgrade to a paid certificate
Purchase an individual test certificate (pro) or an official certificate from SSL Certificates Service. Paid certificates provide better technical support.
For purchase instructions, see Purchase SSL certificates.