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Remove-LockDownVPN.ps1
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<#
.SYNOPSIS
PowerShell script to remove a LockDown Always On VPN connection.
.PARAMETER ConnectionName
The LockDown VPN connection name to be removed.
.EXAMPLE
.\Remove-LockDownVPN.ps1 -ConnectionName 'Always On LockDown VPN'
.DESCRIPTION
A LockDown Always On VPN connection cannot be removed using traditional methods such as Remove-VpnConnection. This script allows the administrator to successfully remove a previously configured LockDown VPN connection.
NOTE: This script must be run in the context of the local SYSTEM account. Use the Sysinternals tools Psexec.exe with the -i and -s parameters to launch PowerShell and run the script. Refer to the link below for more information.
.LINK
https://directaccess.richardhicks.com/2019/04/08/always-on-vpn-lockdown-mode/
.NOTES
Version: 1.0
Creation Date: December 29, 2019
Last Updated: December 29, 2019
Author: Richard Hicks
Organization: Richard M. Hicks Consulting, Inc.
Contact: [email protected]
Web Site: www.richardhicks.com
#>
[CmdletBinding()]
Param(
[string]$ConnectionName
)
# Script must be running in the context of the SYSTEM account. Validate user, exit if not running as SYSTEM
$CurrentPrincipal = New-Object Security.Principal.WindowsPrincipal([Security.Principal.WindowsIdentity]::GetCurrent())
$CurrentUserName = $CurrentPrincipal.Identities.Name
If ($CurrentUserName -ne 'NT AUTHORITY\SYSTEM') {
Write-Warning 'This script is not running in the SYSTEM context, as required.'
Write-Warning 'Use the Sysinternals tool Psexec.exe with the -i and -s parameters to run this script in the context of the local SYSTEM account.'
Write-Warning 'Details here - https://rmhci.co/2IhuLOC.'
Write-Warning 'Exiting script.'
Exit
}
# Validate lockdown VPN connection
Write-Verbose "Validating VPN connection ""$ConnectionName""..."
$Vpn = Get-VpnConnection -AllUserConnection -Name $ConnectionName -ErrorAction SilentlyContinue
If ($Vpn -eq $Null) {
Write-Warning "LockDown VPN connection ""$ConnectionName"" not found. Exiting script."
Exit
}
# Remove spaces from connection name
$ConnectionNameEscaped = $ConnectionName -replace ' ', '%20'
# Get lockdown VPN connection
$CimInstance = Get-CimInstance -Namespace 'root\cimv2\mdm\dmmap' -ClassName 'MDM_VPNv2_01' -Filter "ParentID='./Vendor/MSFT/VPNv2' and InstanceID='$ConnectionNameEscaped'"
# Remove lockdown VPN connection
Write-Output "Removing LockDown VPN Connection ""$ConnectionName""..."
Remove-CimInstance -CimInstance $CimInstance
Write-Output "LockDown VPN connection ""$ConnectionName"" removed."
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