Deletes registered session configurations from the computer.


          [-Name] <String>


The Unregister-PSSessionConfiguration cmdlet deletes registered session configurations from the computer. This cmdlet is designed for system administrators to manage customized session configurations for users.

To make the change effective, Unregister-PSSessionConfiguration restarts the WinRM service. To prevent the restart, specify the NoServiceRestart parameter.

If you accidentally delete the default Microsoft.PowerShell or Microsoft.PowerShell32 session configurations, use the Enable-PSRemoting cmdlet to restore them. For more information, see about_Session_Configurations.


Example 1: Delete a session configuration

This example deletes the MaintenanceShell session configuration from the computer.

Unregister-PSSessionConfiguration -Name "MaintenanceShell"

Example 2: Delete a session configuration and restart the WinRM service

In this example, we delete the MaintenanceShell configuration and restart the WinRM service. The Force parameter suppresses all user messages to restart the WinRM service without prompting.

Unregister-PSSessionConfiguration -Name MaintenanceShell -Force

Example 3: Delete all session configurations

This examples show two ways to delete all the session configurations on the computer. Both commands have the same effect and can be used interchangeably.

Unregister-PSSessionConfiguration -Name *
Get-PSSessionConfiguration -Name * | Unregister-PSSessionConfiguration

Example 4: Unregister without a restart

This example shows the effect of using the NoServiceRestart parameter to prevent a service restart that would disrupt any sessions on the computer.

PS> Unregister-PSSessionConfiguration -Name "MaintenanceShell" -NoServiceRestart
PS> Get-PSSessionConfiguration -Name "MaintenanceShell"

Get-PSSessionConfiguration -Name MaintenanceShell : No Session Configuration matches criteria "MaintenanceShell".
+ CategoryInfo          : NotSpecified: (:) [Write-Error], WriteErrorException
+ FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException

PS> New-PSSession -ConfigurationName "MaintenanceShell"

Id Name      ComputerName    State    Configuration         Availability
-- ----      ------------    -----    -------------         ------------
1 Session1  localhost       Opened   MaintenanceShell      Available

PS> Restart-Service winrm
PS> New-PSSession -ConfigurationName MaintenanceShell

[localhost] Connecting to remote server failed with the following error message :
 The WS-Management service cannot process the request.
 The resource URI (http://schemas.microsoft.com/powershell/MaintenanceShell) was not found in the WS-Management catalog.
 The catalog contains the metadata that describes resources, or logical endpoints.
 For more information, see the about_Remote_Troubleshooting Help topic.
 + CategoryInfo          : OpenError: (System.Manageme....RemoteRunspace:RemoteRunspace) [], PSRemotingTransportException
 + FullyQualifiedErrorId : PSSessionOpenFailed

The Unregister-PSSessionConfiguration deletes the MaintenanceShell session configuration. However, because the command uses the NoServiceRestart parameter, the WinRM service is not restarted and the change is not yet completely effective.

Next, the Get-PSSessionConfiguration tries to get the MaintenanceShell session. Because the session has been removed from the WS-Management resource table, Get-PSSessionConfiguration cannot return it.

The New-PSSession cmdlet creates a session using the MaintenanceShell configuration. The command succeeds. Next, we restart the WinRM service.

Finally, the New-PSSession cmdlet tries to create a session that uses the MaintenanceShell configuration. This time, the session fails because the MaintenanceShell configuration was deleted when the WinRM service restarted.



Prompts you for confirmation before running the cmdlet.

Default value:False
Accept pipeline input:False
Accept wildcard characters:False

Indicates that the cmdlet does not prompt you for confirmation, and restarts the WinRM service without prompting. Restarting the service makes the configuration change effective.

To prevent a restart and suppress the restart prompt, use the NoServiceRestart parameter.

Default value:None
Accept pipeline input:False
Accept wildcard characters:False

Specifies the names of the session configurations to delete. Enter one session configuration name or a configuration name pattern. Wildcard characters are permitted. This parameter is required.

You can also pipe a session configurations to Unregister-PSSessionConfiguration.

Default value:None
Accept pipeline input:True
Accept wildcard characters:True

Indicates that this cmdlet does not restart the WinRM service, and suppresses the prompt to restart the service.

By default, when you run an Unregister-PSSessionConfiguration command, you are prompted to restart the WinRM service to make the change effective. Until the WinRM service is restarted, users can still use the unregistered session configuration, even though Get-PSSessionConfiguration does not find it.

To restart the WinRM service without prompting, specify the Force parameter. To restart the WinRM service manually, use the Restart-Service cmdlet.

Default value:None
Accept pipeline input:False
Accept wildcard characters:False

Shows what would happen if the cmdlet runs. The cmdlet is not run.

Default value:False
Accept pipeline input:False
Accept wildcard characters:False



You can pipe a session configuration object from Get-PSSessionConfiguration to this cmdlet.



This cmdlet does not return any objects.


This cmdlet is only available on Windows platforms.

To run this cmdlet you must start PowerShell by using the Run as administrator option.