Will You Be Impacted by Let’sEncrypt DST Root CA X3 Expiration?

Liejun Tao
May 20 · 10 min read

Today (Monday 5/17/2021) morning I got an email from Let’s Encrypt talking about its Root CA expiration on 9/30/2021. Thanks for this early notice which gives me abundant time to prepare for it.

I still remember last year when the Sectigo root certificate expired I only realized after one of my services was broken.

The first thought for me is “oh my xx let me check if I will be impacted again”. After some research I find the method to verify if a client/server will be impacted by the change, and…