How to fix Let’s Encrypt certificates error after 09/30/2021


Reason: DST Root CA X3 Certificate Expires at 09/30/2021

DST Root CA X3 Certificate Expiration

Fix on Windows:

Step 1: Run certmgr.msc

Step 2: Download files:
https://letsencrypt.org/certs/isrgrootx1.pem
https://letsencrypt.org/certs/isrg-root-x2.pem

Step 3: Trusted Root Certificates Authorities -> Certificates (Right click) -> Import two files we download at step 2:

import certificates

Step 4: Download file:
https://letsencrypt.org/certs/lets-encrypt-r3.pem

Step 5: Intermediate Certificates Authorities -> Certificates (Right click) -> Import the file we download at step 4:
import certificates 2

Done!

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