https://letsencrypt.org/certs/isrgroo...
I haven't got a main-line video done this week, so have a quick short!
Let's Encrypt's root cert expired at the end of September, and while modern machines will just auto-update with the new cert, unsupported operating systems won't. This is why 10.11 and older macs are now suddenly giving random SSL errors everywhere. Solution is to download the new cert from https://letsencrypt.org/certs/isrgroo... and manually install it in Keychain access.
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