Hi all, I used to have the following ASP code (below) that runs on windows 2000 and authenticates users against the Active Directory. The code is working fine. However, after upgrading from Win2000 to Win2003 (IIS 6), authentication is failing, although the code is still working if run on win2000. I tried to capture packets during the authentication phase from both win2000 and win2003 and I found out that there is a slight difference between the two although I believe that this is an OS bit not ASP thing. Here is the ASP code for AD authentication: username = "\" & Request.Form("username") password = Request.Form("password") domain = "domain.pre" Set adoCon = Server.CreateObject("ADODB.Connection") adoCon.Provider = "ADsDSOOBJECT" adoCon.Properties("User ID") = username adoCon.Properties("Password") = password adoCon.Properties("Encrypt Password") = true adoCon.Open "DS Query", username, password strQuery = "SELECT cn FROM 'LDAP://" & domain & "' WHERE objectClass='*' " set cmd = Server.CreateObject("ADODB.Command") set cmd.ActiveConnection = adoCon cmd.CommandText = strQuery on error resume next set rs = cmd.Execute if rs.bof or rs.eof then Response.Redirect("main.html") else Session("logged_in")="yes" Session("username")=username Response.Redirect("user.asp") end if I would appreciate any help or support on this. Thanks in advance, A