Validating Active Directory Credentials

PowerShell can validate AD username and passwords against the Active Directory:

Add-Type -AssemblyName System.DirectoryServices.AccountManagement
$account = New-Object System.DirectoryServices.AccountManagement.PrincipalContext([DirectoryServices.AccountManagement.ContextType]::Domain, $env:userdomain)

$account.ValidateCredentials('user12', 'topSecret')

Note that this approach is for diagnostic purposes only. It accepts a plain text password.

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