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Block-FileShareAccess

Blocks access to a file share.

Windows Server · Risk: High · Documentation Verified

Last verified: 2026-10-26

Microsoft Storage reference: Blocks access to a file share. The syntax and selected example below are adapted from the pinned Windows Server 2025 reference. Module availability, target configuration and delegated permissions determine whether it can run in your environment. Documentation and parameter text: Microsoft, CC BY 4.0; formatting adapted by Cmdlet World. No execution testing is claimed.

Block-FileShareAccess -Name <String[]> [-FileServer <CimInstance>] -AccountName <String[]>
 [-CimSession <CimSession[]>] [-ThrottleLimit <Int32>] [-AsJob] [-PassThru] [-WhatIf] [-Confirm]
 [<CommonParameters>]

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Required permissions

Use an account with the target resource permissions documented for Block-FileShareAccess. Modifying administrative cmdlets may require elevation or delegated administration. This catalog does not assert that ordinary users can execute the command.

Supported environments

Windows / Storage · Windows Server 2025 documentation; feature/module prerequisites apply

Parameters

-AccountName (required): Specifies an array of account names to block.
-AsJob: Runs the cmdlet as a background job. Use this parameter to run commands that take a long time to complete.
-CimSession: Runs the cmdlet in a remote session or on a remote computer. Enter a computer name or a session object, such as the output of a New-CimSession or Get-CimSession cmdlet. The default is the current session on the local computer.
-Confirm: Prompts you for confirmation before running the cmdlet.
-FileServer: Specifies a file server on which to set permissions.
-InputObject (required): Specifies the input object that is used in a pipeline command.
-Name (required): Specifies the name of the file share for which the user is being granted access. Because the share name is not a worldwide unique name, use a different parameter set to avoid confusion.
-PassThru: Returns an object representing the item with which you are working. By default, this cmdlet does not generate any output.
-ThrottleLimit: Specifies the maximum number of concurrent operations that can be established to run the cmdlet. If this parameter is omitted or a value of 0 is entered, then Windows PowerShell® calculates an optimum throttle limit for the cmdlet based on the number of CIM cmdlets that are running on the computer. The throttle limit applies only to the current cmdlet, not to the session or to the computer.
-UniqueId (required): Specifies an array of unique IDs.
-WhatIf: Shows what would happen if the cmdlet runs. The cmdlet is not run.

Prerequisites

Windows with the Storage module and the Windows feature or management tools that provide it. Confirm target connectivity and version compatibility using the linked Microsoft reference.

Security considerations

This cmdlet changes system state. Review every target and parameter in the official reference, test outside production, and prepare an appropriate backup or rollback. Do not execute the example automatically.

Examples

Example 1: Block file share access

Block-FileShareAccess -Name "VMFiles" -AccountName "Contoso\Guest"

This command blocks the Guest account from accessing VMFiles. Source: Microsoft, CC BY 4.0; transcript prompt/output removed. This example was not executed.

Sources

https://github.com/MicrosoftDocs/windows-powershell-docs/blob/b7645dd8c687139b28e845119da30ec670526507/docset/winserver2025-ps/Storage/Block-FileShareAccess.md

https://learn.microsoft.com/powershell/module/storage/block-fileshareaccess?view=windowsserver2025-ps

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