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Helpful answers
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Mar 13, 2016 3:07 PM in response to XavierGrantby Linc Davis,If you've enabled two-step verification for your Apple ID, you must generate an application-specific password and enter it when you sign in to the App Store.
If you've ruled out the password as the cause of the problem, please back up all data and see below.
Triple-click anywhere in the line below on this page to select it:
/Library/Preferences/SystemConfiguration
Right-click or control-click the line and select
Services ▹ Open
from the contextual menu.* A folder named "SystemConfiguration" should open. Inside it there should be a file with this name:
NetworkInterfaces.plist
Move that file to the Trash. You may be prompted for your administrator login password. Restart the computer and test.
If there's no change, restore the item you deleted from a backup, overwriting the one that may have been created in its place. Otherwise, you may need to recreate some of your settings in the Network preference pane.
*If you don't see the contextual menu item, copy the selected text to the Clipboard by pressing the key combination command-C. In the Finder, select
Go ▹ Go to Folder...
from the menu bar and paste into the box that opens by pressing command-V. You may not see what you pasted because a line break is included. Press return.
Credit for this solution to ASC member luis.pinho.
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Mar 13, 2016 3:47 PM in response to Linc Davisby XavierGrant,I'm backing up now & will try your fix. Thanks for the quick reply. What is the theory of the fix?
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Mar 13, 2016 3:48 PM in response to Csound1by XavierGrant,When you try to upgrade to El Capitan, the system wants you to log in with your Apple ID and password. That's the point at which the upgrade request fails.
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Mar 13, 2016 4:06 PM in response to XavierGrantby Csound1,XavierGrant wrote:
When you try to upgrade to El Capitan, the system wants you to log in with your Apple ID and password. That's the point at which the upgrade request fails.
Did you enter the ID and password