OS X El Capitan: Allow network users to log in to your Mac
If your Mac is joined to a network account server, you can specify which network users can log in to your Mac, and list the names of authorized users in the login window.
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Choose Apple menu > System Preferences, click Users & Groups, then click Login Options.
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Click the lock icon
to unlock it, then enter an administrator name and password. -
Select “Allow network users to log in at login window,” then click Options.
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Do one of the following:
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Select “All network users,” then click Done.
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Select “Only these network users.” Click the Add button
, click Network Users or Network Groups, then choose the users or groups permitted to log in to your Mac. Click Done.
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To display the names of authorized users during login, select “List of users” for the “Display login window as” setting.