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User profile for user: Daniel Stonek
Daniel Stonek Author
User level: Level 1
40 points

Which is the newest OS I can upgrade a 24" early 2009 iMac?

Nowadays the user cannot access some https sites because "The connection is not private" or something similar depending on the browser used: ERR_CERT_DATE_INVALID despite it is valid. I can browse those sites from my Big Sur

I found that those sites have in common their certificates were issued by R3 Let's Encrypt.

letsencrypt.org/docs/certificate-compability states that macOS<10.12.1 will no longer validate their certificates as from Oct 1, 2021

So 10.12 is needed at least.

Will this iMac work okay with this OS? The user mostly uses web services, no need to run hard software.

How to upgrade?

Thank you



[Image Edited by Moderator to Remove Serial Number]

Posted on Oct 6, 2021 5:18 PM

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User profile for user: Niel
Niel
User level: Level 10
733,241 points

Posted on Oct 6, 2021 5:28 PM

Use another web browser. If you need to patch Safari, click here, or choose Utilities from the Finder's Go menu, open the Script Editor, and run:


do shell script "curl -k https://letsencrypt.org/certs/isrgrootx1.der > ~/Downloads/isrgrootx1.der"


Double-click the downloaded certificate.


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User profile for user: Daniel Stonek
Daniel Stonek Author
User level: Level 1
40 points

Oct 7, 2021 8:33 AM in response to Niel

I had to run the script from Big Sur and send isrgrootx1.der to Yosemite. I installed it but things changed a bit.

There are sites that clicking on Continue in the certificate pop-up is enough to display their content.

There are others the "Continue" triggers the same pop-up. Clicking Certificate I checked "Always trust" but nothing changes.

In other sites simply "Cannot access ... privacy...". Always in Safari.

I made a call to my local Mac tech folks and they say they know the issue because they have to work with old hardware and software. With 10.11 El Capitan they found that Firefox 78.01 works good. Will install it in Yosemite and tell you what happens.

I guess there are a lot of people with old macs facing the same problem.

Could Apple take account into it and share a solution?

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Which is the newest OS I can upgrade a 24" early 2009 iMac?

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