Let's Encrypt issues TLS certificates with a 90-day validity period by default. However, as the industry is gradually shortening TLS certificate lifetimes—with the maximum eventually expected to fall to 47 days—Let's Encrypt already offers certificates using the tlsserver profile with a validity period of 45 days. Compared with the current default classic profile, the tlsserver profile removes deprecated attributes such as the Common Name. Because it follows the latest recommended confi...