First of all, many thanks to the wonderful Let’s Encrypt community for all the help with this, credit where credit is due: https://community.letsencrypt.org/t/rhel-centos-6-openssl-client-compatibility-after-dst-root-ca-x3-expiration/161032
That is a lengthy thread, and after a lot of trial and error and considerable head scratching I wanted to share the fix that worked for us, from start to finish. Hopefully it’ll save you some time so you can get back to your wgets and API calls.
Here are the steps that worked for us:
Continue reading Let’s Encrypt expired root (X3) certificate fix on a CentOS 6 server




