PowerShell: Check if credentials are valid


When I was trying to configure a scheduled task to use a specific service account the task manager did not want to accept my service account credentials.
I wanted a quick way to find out if the credentials I was using where correct. Some quick browsing on the web lead me to this.


The code requests credentials and checks them with your AD using the DirectoryServices.

$cred = Get-Credential #Read credentials
$username = $cred.username
$password = $cred.GetNetworkCredential().password

# Get current domain using logged-on user's credentials
$CurrentDomain = "LDAP://" + ([ADSI]"").distinguishedName
$domain = New-Object System.DirectoryServices.DirectoryEntry($CurrentDomain,$UserName,$Password)

if ($domain.name -eq $null){
    write-host "Authentication failed - please verify your username and password." -ForegroundColor Red
} else {
    write-host "Successfully authenticated with domain $domain.name" -ForegroundColor Green

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