DST Root C X3 Certificate expired on 30th September.

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Level 1

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DST Root C X3 Certificate expired on 30th September.

Hi, I have an old IMAC around 10 years old with an El Capitan system and it works fine. The DST Root C X3 Certificate expired on 30th September. I am now getting unsafe messages from previously trusted sites including my own website. I can´t download the fix from Lets Encrypt as it is showing unsafe. Any ideas?

Posted on Oct 9, 2021 2:33 AM

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Answer 1

a brody

Level 10

85,314 points

Oct 9, 2021 3:17 PM in response to LHSFR

Use a different browser if the certificate complaint is from a web browser:

https://discussions.apple.com/docs/DOC-250003586

If trying to upgrade your Mac, determine first if it is possible to upgrade to Sierra.

https://discussions.apple.com/thread/251675475 is a discussion that helps with older certificates on some of Apple's downloads.

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DST Root C X3 Certificate expired on 30th September.

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