Let's Encrypt root CA isn't working properly

[whupanglong]

Versions

• nuxt: 2.15.8
• node: 8.16.1
• system: ubuntu 18.04
• nginx 1.14.0

on Oct 1st, let's encrypt has changed it's certificate method ,see here: https://letsencrypt.org/2021/10/01/cert-chaining-help.html
and our nuxt projects are all down ,like : https://m.ppcanyin.cn/

open this link will see:
"Server error
An error occurred in the application and your page could not be served. If you are the application owner, check your logs for details."

Error Log like this:
"ERROR certificate has expired

at TLSSocket. (_tls_wrap.js:1116:38)
at emitNone (events.js:106:13)
at TLSSocket.emit (events.js:208:7)
at TLSSocket._finishInit (_tls_wrap.js:643:8)
at TLSWrap.ssl.onhandshakedone (_tls_wrap.js:473:38)"

I have tried to regenerate the ssl files but failed, (from electron issue zone: electron/electron#31212)
through:

1. sudo certbot --nginx --preferred-chain "ISRG Root X1" -d m.ppcanyin.cn
2. sudo service nginx restart

Does anyone has same problem with me ? How to solve it? thanks a lot!

[whupanglong]

sorry， after a long time struggle , I found the bug is from my node server (express) ，update ssl licence for api.xxx， it worked