Fix iCloud error and 'Unable to establish a secure connection to idmsa.apple.com' on MacOS Sierra and High Sierra

Fix "Unable to establish a secure connection to idmsa.apple.com", iCloud and Apple ID errors on Safari in MacOS Sierra, High Sierra

To fix the Safari idmsa.apple.com connection error , Unable to use Apple ID error and iCloud error, please use a working web browser on the affected MacOS and do the following:

1. Go to the Apple Certificate page here: https:// /www.apple.com/certificateauthority/
2. Download the Apple intermediate certificate labeled "Apple IST CA 2 – G1 Certificate" (direct link to AppleISTCA2G1.cer)
3. Download the AppleISTCA2G1.cer file After that, go to the Downloads folder and double-click on the certificate to install it into Keychain Access
4. The "Apple IST CA 2 – G1" entry should now show up in Keychain Access
5. Restart Safari to resolve Safari connection error. Alternatively, restart your Mac to resolve the System Preferences iCloud error

Many Mac users continue to run older versions of system software, such as MacOS High Sierra and MacOS Sierra, either due to issues with certain old applications and game compatibility reasons, or because older hardware doesn't support newer versions of MacOS, due to personal preference, and any number of other reasons.

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