Why this code return no errors even if I entered incorrect username?

I am authenticate users on Active Directory but error number (Err.Number ) is *always* zero even if I entered incorrect username!

Here is the code that I run on XP machine:


Function IsAuthenticated(Domain, Username, Password)
   On Error Resume Next
   Dim authNamespace, authObject
   Set authNamespace = GetObject("WinNT:")
   Set authObject = authNamespace.OpenDSObject("WinNT://" & Domain, Domain & "\" & strUsername, strPassword, ADS_SECURE_AUTHENTICATION)
   If Err.Number <> 0 Then
        IsAuthenticated = False
        IsAuthenticated = True
   End If
   Set authNamespace = Nothing
   Set authObject = Nothing
End Function


Please help!
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Set authObject = authNamespace.OpenDSObject("WinNT://" & Domain, Domain & "\" & strUsername, strPassword, ADS_SECURE_AUTHENTICATION)


Set authObject = authNamespace.OpenDSObject("WinNT://" & Domain, Username, Password, ADS_SECURE_AUTHENTICATION)

When Username, Password is empty, no error is raised. Also You don't need to append the Domain to username.

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Abdu_AllahAuthor Commented:
amit_g Here is another question regarding AD:
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