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I'm a non-network pro who has a situation with one of our largest clients. They get the red Certificate Invalid icon, because of an outdated, expired root certificate. However, our certificate is up to date, and none of our other clients have this problem.

enter image description here

In fact, it happens only on about half of their computers and not others, despite having the same network, the same computers, and using the same browser. This is on mac/Chrome, and clearing their cache - which I've read will clear certificates as well - also doesn't do anything.

This company is known to have really strict security.

Any thoughts about why similar computers on this same network might not be renewing certificates?

Thanks.

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  • Are the all computers updated?
    – Romeo Ninov
    Commented Jan 24, 2023 at 7:21
  • What CA is the intermediate certificate from? (That is, the one between server cert and root cert.) There is a certain widely known certificate authority whose intermediates are cross-signed by two different root CAs, and depending on the system (some devices may have the new root installed and others not; some OS are better at building alternate validation paths than others) the different results can happen.
    – grawity_u1686
    Commented Jan 24, 2023 at 7:48
  • Is this question entirely about macOS? If so, which version of macOS?
    – Daniel B
    Commented Jan 24, 2023 at 7:58
  • It sounds like those that failed are running an old o/s version.
    – Bob Goddard
    Commented Jan 24, 2023 at 17:55
  • @DanielB seems to be happening w/ Yosemite.
    – daprezjer
    Commented Jan 27, 2023 at 14:10

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