Error when using Google Chrome on Mac OS X El Capitan (10.11.6)
To solve this issue:
- Download ISRG Root X1 cert file from http://x1.i.lencr.org/
- Open Keychain Access
- Drag the file to “System” folder
- Double click the file and set “Always Trust”
Reference: https://docs.certifytheweb.com/docs/kb/kb-202109-letsencrypt/#macos-ios-etc