Letsencrypt certificate expired! Anonymous 4 years ago updated 4 years ago Answered Since the IdentTrust DST Root CA X3 certificate expiring in September, 2021, my website is receiving a "not secure" warning in Chrome (Windows 7). Considering that 12% of windows users are still using win7, does Inmotion have any advice on how to remove such warnings. I have read that rebooting the server OS might resolve the issue.