Privacy Errors

[Lynne326]

Hi! Can someone tell me why I keep getting "Your connection is not private" errors all of a sudden on my Macbook Pro?

The only browser it DOESN'T happen on is Firefox. If I use Brave, Safari, or Chrome I get the privacy error. I get an error on EVERY site I click on in those browsers. I've tried adjusting the security options in preferences in those browsers, but still get the errors.

It's not my OSX because I have the exact same OSX on my Mac Mini and do not have any issues with privacy errors. I'm running El Capitan 10.11.6, but I won't upgrade because I'll lose all my Adobe programs that won't function with an upgrade.

Thanks SO much for any help!

 

[Fishrrman]

See this page:

Let's Encrypt DST Root CA X3 expiry Sept 30th 2021 | Certify The Web Docs

Certificate trust mainly relies on the "root" issuing certificate (and intermediate certificates) being trusted by your computer.

docs.certifytheweb.com

And this one:

Why won’t Safari open that web page?

Did you think it was only old Mac OS X affected by the Let’s Encrypt certificate expiry problem? No, it’s Safari wherever you can use it. Here’s how to deal with it.

eclecticlight.co

 

[Lynne326]

Thank you Fishrrman. I looked at those links. Do you think I should do this?: