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Level 1

40 points

How I solved the Safari 13 and High Sierra problem with idmsa.apple.com unsecure connection (all Apple logins)

Like many other users since February I have encountered the "Safari 13.x - High Sierra" issue related to every Apple login service (iCloud, Apple store, developer.apple.com, Apple communities etc. ).

Here you can read some discussions concerning the issue:

https://discussions.apple.com/thread/251108056?answerId=252098530022&page=2

https://discussions.apple.com/thread/251210686

https://discussions.apple.com/thread/251196415

I tried everything, like them, without success. Then I found a solution that worked form me:

Go on the Apple certificate page:

https://www.apple.com/certificateauthority/

Download the Apple Intermediate Certificates

Apple IST CA 2 - G1 Certificate

Double click the downloaded certificate to install it in Keychain Access.
You should see it now, in login certificates.

Voilà, now Safari should be able to work like usual.

This is what worked for me and I hope for you too. 🙂

Posted on Mar 25, 2020 1:50 AM

Best reply

Ron Snow

Level 1

34 points

Posted on Jan 18, 2021 6:19 PM

I have had this problem for at least a year. I can't use Safari on my MBP 15" (HighSierra 10.13.6) to access the apple store, use iCloud.com, or check my orders; instead, I have to use Chrome or Firefox (on the same mac) to access. When I tried installing the certificate "Apple IST CA 2 - G1 Certificate" as per above, I get a warning that the certificates are locked and I can't get past that error.
I tried the Python script mentioned below and that was, finally and thank god, successful. (See https://discussions.apple.com/thread/251210686?answerId=252326921022#252326921022).

Thanks to all for finally getting a fix that works.

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How I solved the Safari 13 and High Sierra problem with idmsa.apple.com unsecure connection (all Apple logins)

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