Tool to test a user account and password (test login)

Solution 1:

runas /u:yourdomain\a_test_user notepad.exe

The utility will prompt for the password, if the right password has been provided, notepad will launch, if not it will produce error 1326: the username or password is incorrect

Solution 2:

Powershell script:

#usage: Test-UserCredential -username UserNameToTest -password (Read-Host)

Function Test-UserCredential { 
    Param($username, $password) 
    Add-Type -AssemblyName System.DirectoryServices.AccountManagement 
    $ct = [System.DirectoryServices.AccountManagement.ContextType]::Machine, $env:computername 
    $opt = [System.DirectoryServices.AccountManagement.ContextOptions]::SimpleBind 
    $pc = New-Object System.DirectoryServices.AccountManagement.PrincipalContext -ArgumentList $ct 
    $Result = $pc.ValidateCredentials($username, $password).ToString() 
    $Result 
} 

http://powershellcommunity.org/Forums/tabid/54/aft/8034/Default.aspx

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Solution 3:

You can also use:

net use \\computername\sharename [password] /USER:]username]

If there's a share by that name on the remote computer. Or, use C$ if the account is an admin.