About This post is a collaboration between bigphil and myself of the FreeNAS forum pooling our knowledge together of making FreeNAS work with the various flavors of Active Directory in our respective work & home environments, in order to use Windows based permissions on files hosted on the FreeNAS server. Tested This how-to has been tested with the following software releases, with this how-to being written using Windows Server 2008 & FreeNAS 220.127.116.11: FreeNAS v9.1.1-RELEASE-x64 (a752d35) FreeNAS v18.104.22.168.1-RELEASE-x64 (fec915c) FreeNAS v22.214.171.124-RELEASE-x64 (80c1d35) Microsoft Windows Server 2008 Microsoft Windows Server 2008 R2 Microsoft Windows Server 2012 R2 Assumptions Active Directory support (installation, configuration) is beyond the scope of this document, because ... This how-to assumes you already have a working Active Directory installation. We assume you have the required access to create user and computer objects in Active Directory, as well as access to create the necessary records required in DNS. We assume you are using a fresh install of FreeNAS. We assume you have a current backup of your Active Directory setup. We are not responsible for YOU breaking YOUR Active Directory (not that you will, but "stuff" happens). The next 4 posts will detail the required steps for prepping Active Directory, then configuring FreeNAS to work with Active Directory, using the "Computer Management" MMC snap-in to configure permissions on the FreeNAS CIFS share, and current bug(s) with (their) solution(s).