ADSI Authentication to WinNT Provider

I want to authenticate  a user from my web page (.NET) using ADSI. I think I've got the code correct, but I get the following error:

Unspecified Error
System.Runtime.InteropServices.COMExeption

It seems to bom out when the OpenDSObject method is called. Here's the code

Dim objADSI, strUsername, strPassword, strDomain
Dim strADsNamespace
Dim objADSINamespace
Dim blnFound

strUsername = " Trim(txtUsername.Text)"
strPassword = Trim(txtPassword.Text)

strDomain = "MYDOMAIN"
objADSI = GetObject("WinNT://" & strDomain)

strADsNamespace = Left("WinNT://" & strDomain, InStr("WinNT://" & strDomain, ":"))

objADSINamespace = GetObject(strADsNamespace)
bjADSI = objADSINamespace.OpenDSObject("WinNT://" & strDomain, strUsername, strPassword, 0)

If Err.Number <> 0 Then
    blnFound = False
Else
    blnFound = True
End If

Thanking you
       
hattinnhAsked:
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TheKenmanConnect With a Mentor Commented:
Are you trying to do it like this: http://www.eggheadcafe.com/articles/20010126.asp ?
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TheKenmanCommented:
You're missing some set statements, and I gave you some error handlers to help as well. I think your code should be something like this:

strDomain = "MYDOMAIN"
strADsPath = "WinNT://" & strDomain
strADsNamespace = Left(strADsPath, InStr(strADsPath, ":"))

On Error Resume Next
Set objADSI = GetObject(strADsPath)
   If Err.Number <> 0 Then
        response.write "Error with Set objADSI = GetObject(strADsPath)<BR>strADsPath: " & strADsPath
        response.end
   End If
Set objADSINamespace = GetObject(strADsNamespace)    
   If Err.Number <> 0 Then
        response.write "Error with Set objADSINamespace = GetObject(strADsNamespace)<BR>strADsNamespace: " & strADsNamespace
        response.end
   End If
Set objADSI = objADSINamespace.OpenDSObject(strADsPath, strUsername, strPassword, 0)
   If Err.Number <> 0 Then
        response.write "Error with Set objADSI = objADSINamespace.OpenDSObject(strADsPath, strUsername, strPassword, 0)<BR>strADsPath: " & strADsPath & "<BR>strUsername: " & strUsername & "<BR>strPassword: " & strPassword
        response.end
   End If
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