How To Connect to Active Directory User Validation

1. Windows PowerShell – Connect to Active Directory User Validation
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Table of Contents
Overview.......................................................................................................................................................1
Applies To..................................................................................................................................................1
Pre-Requisites ...........................................................................................................................................1
Current Execution Policy...........................................................................................................................2
PowerShell Script – Connect AD ...................................................................................................................2
Code Snippet – Connect to AD..................................................................................................................2
PowerShell Execution – Connect Active Directory (AD) .......................................................................3
PowerShell Output – Key-In Authentication Information.....................................................................4
PowerShell Output – List AD User Attribute.........................................................................................4
PowerShell Output – List AD User Attribute.........................................................................................5
PowerShell Output – User Doesn’t Exists .............................................................................................5

2. Windows PowerShell – Connect to Active Directory User Validation
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Overview
In this guide we will demonstrate, establishing connection to active directory, this script could be run on
local active directory or remote AD server.
Applies To
Tested on Windows 10, Windows 2008 R2 and Windows 2012.
Pre-Requisites
1) Active Directory should be installed and configured on the server.
2) Access to Active Directory for the user is needed.
3) Firewall should be configured to enable traffic for port 839 on the AD Server.
4) Launch PowerShell Command Console or PowerShell ISE.
To run this script, Execution Policy should be set to either of these “AllSigned” or “RemoteSigned” or
“Unrestricted”, you can get current execution policy by running the command; “Get-ExecutionPolicy”.
Each Execution Policy type and its purpose is shown in the below table.
Policy Type Purpose
Restricted No scripts can be run. Windows PowerShell can be used only in interactive mode.
AllSigned Only scripts signed by a trusted publisher can be run.
RemoteSigned Downloaded scripts must be signed by a trusted publisher before they can be run.
Unrestricted No restrictions; all Windows PowerShell scripts can be run.

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Current Execution Policy
To know the current run the PowerShell cmdlet; Get-ExecutionPolicy
To list execution policies that can be configured run the PowerShell cmdlet; Get-ExecutionPolicy -List
PowerShell Script – Connect AD
In this PowerShell script we will demonstrate only AD connection and list of user, when credentials is
issued and connection to AD is successful, “administrator” account attributes will be listed.
Code Snippet – Connect to AD
This code snippet is for demonstrating “Connecting to Active Directory ”.
Clear-Host
Set-Location $env:USERPROFILE
Push-Location $env:USERPROFILE
#
# Import Active Directory Module
#
Import-Module ActiveDirectory

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#
# Set PS Provider - Active Directory
#
$ADConnection=New-PSDrive -Name ADDrive -PSProvider ActiveDirectory -Root "DC=ftech,DC=com" -
Server f1ind.ftech.com:389 -Credential "ftechvcp.muthukrishna" -ErrorAction Ignore
if ($ADConnection.Name -eq 'ADDrive') {
if ($ADConnection.Name -eq 'ADDrive') {
[System.Console]::Beep(600,500)
Write-host "Connected to Active Directory" -BackgroundColor Black -ForegroundColor Green
}
Set-Location ADDrive:
$GetUserResult=(Get-ADuser -Filter {SamAccountName -eq "administrator"})
if ($GetUserResult -eq $Null)
{
Write-Host "User does not exists!" -BackgroundColor Black -ForegroundColor Red
[System.Console]::Beep(600,500)
Set-Location c:
Push-Location c:
Remove-PSDrive -Name ADDrive
} else {
$GetUserResult
Set-Location c:
Push-Location c:
Remove-PSDrive -Name ADDrive
}
} else {
Write-host "`nUnable to Connect to Active Directory" -BackgroundColor Black -ForegroundColor Red
[System.Console]::Beep(600,500)
}
PowerShell Execution – Connect Active Directory (AD)
When script is executed; the script will ask for credentials and connect to Active Directory is established
when the user’s credentials are correct.
This script will list the user after connecting to Active Directory and list user’s attributes, this script will
also check or validate if the user exists or not.

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PowerShell Output – Key-In Authentication Information
When the script is executed user has to key-In the username and password, who has access to active
directory.
PowerShell Output – List AD User Attribute
When script is executed; once successfully establishing the connection with Active Directory, script will
query and list active directory user’s attributes are listed.

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PowerShell Output – List AD User Attribute
In this output the active directory user’s attributes are listed and the user belongs to a different
Organization Unit (OU). For this output / example in the script we have changed the user to be connected
and queried.
PowerShell Output – User Doesn’t Exists
After successful connection, when the user doesn’t exists in active directory, below message will be
displayed.