We had our CI systems fail today because of this. They were running Ubuntu 16.04. Check the below thread, they say an openssl bug is also a contributing factor.

We had our CI systems fail today because of this. They were running Ubuntu 16.04. Check the below thread, they say an openssl bug is also a contributing factor. Removing the expired root CA fixed the issue for me. (edit: removed from the clients) https://www.reddit.com/r/linux/comments/gshh70/sectigo_root_ca_expiring_may_not_be_handled_well/ https://www.reddit.com/r/linux/comments/gshh70/sectigo_root_...