Finally, I took remote desktop access to my client’s PC to check the certificate details by clicking ‘Not secure’ in the address bar and then Certificate > Details. Then I requested my client to check the website on the Firefox browser from the same machine, and to my surprise, the website loaded without an issue. So how did I fix this? Well, I tried to reproduce the issue on my Chrome browser on Windows, but it worked fine over there. Well, the case was different, the SSL certificate issued for the client website was still valid, but DST Root CA X3 had expired on 30th September 2021, the root certificate that Let’s Encrypt is currently using. Looking at the screenshot, I thought the CRON job might have failed to update the Let’s Encrypt certificate. But you know what I was not even aware of this certificate expiry until one of my clients sent me a screenshot showing his website failing to load on Chrome on Windows.
DST Root CA X3 certificate expired on September 30th, 2021 causing many devices on the internet with an Invalid Certificate error, including the websites and services using the Let’s Encrypt certificates.
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