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Set-VpnAuthProtocol

Configures the authentication method for incoming site-to-site (S2S) VPN interfaces on a Routing and Remote Access (RRAS) server.

Networking / Security · Risk: High · Documentation Verified

Last verified: 2026-10-26

Microsoft RemoteAccess reference: Configures the authentication method for incoming site-to-site (S2S) VPN interfaces on a Routing and Remote Access (RRAS) 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.

Set-VpnAuthProtocol [-UserAuthProtocolAccepted <String[]>] [-TunnelAuthProtocolsAdvertised <String>]
 [-RootCertificateNameToAccept <X509Certificate2>] [-CertificateAdvertised <X509Certificate2>]
 [-SharedSecret <String>] [-PassThru] [-CertificateEKUsToAccept <String[]>] [-CimSession <CimSession[]>]
 [-ThrottleLimit <Int32>] [-AsJob] [-WhatIf] [-Confirm] [<CommonParameters>]

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Required permissions

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

Supported environments

Windows / RemoteAccess · 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.
-CertificateAdvertised: Specifies the certificate to be sent to a peer computer. Applicable only if the TunnelAuthProtocolsAdvertised parameter is set to Certificate.
-CertificateEKUsToAccept: Specifies an array of Certificate Extended Key Usage (EKU) extensions to allow. This parameter is only valid if the UserAuthProtocolAccepted parameter contains certificates.
-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.
-PassThru: Returns an object representing the item with which you are working. By default, this cmdlet does not generate any output.
-RootCertificateNameToAccept: Specifies the root certificates that are allowed. Applicable only if the UserAuthProtocolAccepted parameter contains certificates.
-SharedSecret: Specifies the text of the shared secret for the connection. Applicable only if the TunnelAuthProtocolsAdvertised parameter is set to PSK.
-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.
-TunnelAuthProtocolsAdvertised: Specifies the remote authentication method used by the RRAS server. If this parameter value is set to pre-shared key (PSK), then the SharedSecret parameter is mandatory. If this parameter value is set to Certificate, then the CertificateAdvertised parameter is mandatory. Only one of the values can be specified.
-UserAuthProtocolAccepted: Specifies the local authentication protocols that are allowed.
-WhatIf: Shows what would happen if the cmdlet runs. The cmdlet is not run.

Prerequisites

Windows with the RemoteAccess 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

Set-VpnAuthProtocol -UserAuthProtocolAccepted Certificate -PassThru

This example changes the authentication method used by the server for incoming connections to Certificate and advertises certificates as authentication mechanism to the peer computers. 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/RemoteAccess/Set-VpnAuthProtocol.md

https://learn.microsoft.com/powershell/module/remoteaccess/set-vpnauthprotocol?view=windowsserver2025-ps

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