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Steer clear of special permissions Unless you re a wizard at understanding the interplay of NTFS permissions, resist the temptation to tweak special permissions for individual files or folders. The built-in security settings (Full Control, Modify, Read & Execute) cover most needs adequately. Note that these settings correlate to those made by the Sharing wizard: Co-Owner, Contributor, and Reader.
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You can t change file or folder permissions
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If you re unable to set custom permissions, look for the symptom in this list and try the following problem-solving techniques:
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The Security tab is not visible Do you see only a Sharing tab If so, check the properties for the drive; the most likely explanation is that the drive is formatted using the FAT file system . The Security tab is visible only on NTFS drives . Permission settings are unavailable Check your user account rights . You must be logged on as a member of the Administrators group or be the owner of an object to set its permissions . If you are logged on as a standard user, you can view only your own permission settings; if you select another user and group on the Security tab, the permissions box is empty . The check marks for some users are shaded, and in the Permissions dialog box, the check boxes for those users are unavailable Those permissions are not set explicitly for the file or folder you re viewing . Rather, they re inherited from the folder in which it s stored . (And that folder might, in turn, inherit its permission settings from its parent folder .) To break the inheritance chain, on the Security tab, click Advanced . In the Advanced Security Settings dialog box, click Edit, and then clear Include Inheritable Permissions From This Object s Parent . For more information, see Applying Permissions to Subfolders Through Inheritance, later in this chapter You ve made changes, but the check marks disappear This may not be a problem at all . If you set permissions and apply them to anything other than the default location This Folder, Subfolder, And Files Windows adds a check mark in the Special Permissions box (when viewing permissions for a folder, you have to scroll to the bottom of the Permissions list to see this box) . You can view the applied permissions by clicking Advanced, clicking Edit, selecting the user or group, and clicking Edit .
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In addition to the standard local groups (Administrators and Users, for instance), Windows Vista includes a number of special identities. These users and groups, which are built into the system and can t be deleted, are used to apply special permissions to system resources (including files and folders); in many cases, these identities are placeholders that apply to user accounts based on the way a given account uses the system.
Note
Special identities are often referred to as well-known security identifiers . ers .
Controlling Access with NTFS Permissions
Understanding these built-in accounts and groups is crucial to using advanced NTFS permissions effectively. Table 29-3 lists the most common special identities.
Table 29-3 . Special Identities Available in Windows Vista
Special Identity Everyone Creator Owner Creator Group Owner Rights
Description Includes every user who accesses the computer, including Guests . This group does not include Anonymous logons . Identifies the user or group who created the selected file or folder . A special-purpose SID, new in Windows Vista, that is used to specify access rights for whoever currently owns the file or folder . For more information, see Changes to NTFS Permissions in Windows Vista, in this chapter . Includes any user who logs on with a user name and password . Unlike the Everyone identity, this group does not include users who log on as Guest, even if the Guest account has been assigned a password . Includes any user that logs on locally . Includes any user that logs on through a Remote Desktop connection . Identifies network logons for which credentials are not provided, such as connections to a web server . Anonymous and Interactive logons are mutually exclusive . Includes any user who accesses the computer over a dialup connection . Includes any user that logs on over the network . Does not include interactive logons that use Remote Desktop over a network .
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