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Question: iCloud Login from System Preferences Always Fails

This morning, iCloud began prompting me to sign in to my iCloud account via system preferences. Unfortunately, when I enter my password, the authentication fails with the message "An unknown error occurred."


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I'm able to log in to the iCloud.com website and into this support forum with the same iCloud credentials so it's not an issue of me not knowing my password.


Any suggestion for how to get iCloud working again on macOS (I have version 10.13.3)?


Message was edited by: Steve in Seattle

MacBook Pro with Retina display, iOS 11.2.1, MacBook running macOS 10.13.3

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Today, the issue has gone away on it's own. I have changed nothing on my computer; I haven't even restarted it. At least iCloud is working again.

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Mar 17, 2018 11:49 AM in response to Steve in Seattle In response to Steve in Seattle

Try setting up another admin user account to see if the same problem continues. Also try the Safe Mode.


Safe Mode - About El Capitan
also Sierra


Safe Mode Startup – El Capitan. also Sierra


If it works in the Safe Mode, try running this program when booted normally and then copy and paste the output in a reply. The program was created by Etresoft, a frequent contributor. Please use copy and paste as screen shots can be hard to read. Click “Share Report” button in the toolbar, select “Copy to Clipboard” and then paste into a reply. This will show what is running on your computer. No personal information is shown.

Etrecheck – System Information

Mar 17, 2018 11:49 AM

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Mar 19, 2018 3:45 AM in response to Steve in Seattle In response to Steve in Seattle

Today, the issue has gone away on it's own. I have changed nothing on my computer; I haven't even restarted it. At least iCloud is working again.

Mar 19, 2018 3:45 AM

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User profile for user: Steve in Seattle

Question: iCloud Login from System Preferences Always Fails