Buffalo LS220D0802-EU User Manual page 38

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Enter the desired settings, then click OK.
8
In Advanced Settings, navigate to File Sharing - Folder Setup.
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Click a shared folder for which you want to set access restrictions.
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Click Edit.
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Enable "Access Restrictions".
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Select the level of access for "Domain Users" or "Domain Groups" you added.
: Read and write access allowed : Read access allowed
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: Access prohibited