Hello, a few days ago my ssl Cloudflare inc ECC CA-3 certificate expired, now I can only create a certificate from letsencrypt, but it does not work with Origin Server. Error: certificate has expired
I’d recommend not creating the Let’s Encrypt certificate yourself.
Instead, you should install an Origin Certificate on your origin server and let Cloudflare handle creating the Universal Certificate for you.
Instructions: Origin CA certificates · Cloudflare SSL/TLS docs
The Universal Certificate is created by Let’s Encrypt. When Cloudflare inc ECC CA-3 was created, everything worked. And now he writes an error Error: certificate has expired
Devices must be exceptionally old to not trust Let’s Encrypt’s root (ISRG Root X1) - Chain of Trust - Let's Encrypt
Take a look at knowledgebase: Let's Encrypt DST Root CA X3 expiry Sept 30th 2021 | Certify The Web Docs