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New-SmbServerAlternativePort

Creates a new alternative port for the Server Message Block (SMB) protocol on the local server.

Networking / Security · Risk: High · Documentation Verified

Last verified: 2026-10-26

Microsoft SmbShare reference: Creates a new alternative port for the Server Message Block (SMB) protocol on the local server. 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.

New-SmbServerAlternativePort [-TransportType] <TransportType> [-Port] <UInt16>
 [-EnableInstances] <Instance> [-Force] [-CimSession <CimSession[]>] [-ThrottleLimit <Int32>]
 [-AsJob] [-WhatIf] [-Confirm] [<CommonParameters>]

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Required permissions

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

Supported environments

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

Parameters

-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.
-EnableInstances (required): Enables alternative ports on SMB instances. Currently only the Default instance is allowed. This setting is not used.
-Force: Forces the command to run without asking for user confirmation.
-Port: Specifies the port number that the SMB connection should use.
-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.
-TransportType: Specifies the transport protocol to use for the SMB connection. The only accepted value for this parameter is QUIC.
-WhatIf: Shows what would happen if the cmdlet runs. The cmdlet isn't run.

Prerequisites

Windows with the SmbShare 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: Create a new SMB server alternative port

New-SmbServerAlternativePort -TransportType QUIC -Port 1

This command creates a new SMB server alternative port that uses TCP transport on port number 1. 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/SmbShare/New-SmbServerAlternativePort.md

https://learn.microsoft.com/powershell/module/smbshare/new-smbserveralternativeport?view=windowsserver2025-ps

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