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You can by simply removing domainadmin's group from ntfs file permissions but any domain admin can change the permissions.
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Domain admin accounts should be closely guarded, perhaps, even, with no one person knowing the password.<br />
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The only time you really need domain admin privileges is when your doing something really important/dangerous, like extending the schema. &nbsp;Regular admin duties, like resetting passwords and setting file permissions should not be done using a domain admin account.<br />
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You should not deny domain admin the ability to access certain files; you should deny users the ability to log in as domain admins.
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Why would you like to do that? Domain admins can revert any security measure, it's useless to do this.
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Hi, <br />
<br />
Do you know the best way to block Domain Admins access to Shared Folders on a Windows Server 2012 R2 file server?
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Hi, 

Do you know the best way to block Domain Admins access to Shared Folders on a Windows Server 2012 R2 file server?

Deny Domain Admins access to Shared Folders on Windows Server 2012 R2 file server

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.

Windows Server 2012

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.

Active Directory

Operating system security (OS security) is the process of ensuring OS integrity, confidentiality and availability. OS security refers to specified steps or measures used to protect the OS from threats, viruses, worms, malware or remote hacker intrusions. OS security encompasses all preventive-control techniques, which safeguard any computer assets capable of being stolen, edited or deleted if OS security is compromised, including authentication, passwords and threats to systems and programs.