questa la connessione:

<%
' FileName="Connection_odbc_conn_dsn.htm"
' Type="ADO"
' DesigntimeType="ADO"
' HTTP="true"
' Catalog=""
' Schema=""
Dim MM_conn_login_STRING
MM_conn_login_STRING = "dsn=login;"
%>

questa la pagina di login:

<%@LANGUAGE="VBSCRIPT" CODEPAGE="1252"%>

<%
' *** Validate request to log in to this site.
MM_LoginAction = Request.ServerVariables("URL")
If Request.QueryString<>"" Then MM_LoginAction = MM_LoginAction + "?" + Server.HTMLEncode(Request.QueryString)
MM_valUsername=CStr(Request.Form("username"))
If MM_valUsername <> "" Then
MM_fldUserAuthorization=""
MM_redirectLoginSuccess="visualizza.asp"
MM_redirectLoginFailed="10^.htm"
MM_flag="ADODB.Recordset"
set MM_rsUser = Server.CreateObject(MM_flag)
MM_rsUser.ActiveConnection = MM_conn_prova_STRING
MM_rsUser.Source = "SELECT user, pwd"
If MM_fldUserAuthorization <> "" Then MM_rsUser.Source = MM_rsUser.Source & "," & MM_fldUserAuthorization
MM_rsUser.Source = MM_rsUser.Source & " FROM prova WHERE user='" & Replace(MM_valUsername,"'","''") &"' AND pwd='" & Replace(Request.Form("pwd"),"'","''") & "'"
MM_rsUser.CursorType = 0
MM_rsUser.CursorLocation = 2
MM_rsUser.LockType = 3
MM_rsUser.Open
If Not MM_rsUser.EOF Or Not MM_rsUser.BOF Then
' username and password match - this is a valid user
Session("MM_Username") = MM_valUsername
If (MM_fldUserAuthorization <> "") Then
Session("MM_UserAuthorization") = CStr(MM_rsUser.Fields.Item(MM_fldUserAuthorization ).Value)
Else
Session("MM_UserAuthorization") = ""
End If
if CStr(Request.QueryString("accessdenied")) <> "" And false Then
MM_redirectLoginSuccess = Request.QueryString("accessdenied")
End If
MM_rsUser.Close
Response.Redirect(MM_redirectLoginSuccess)
End If
MM_rsUser.Close
Response.Redirect(MM_redirectLoginFailed)
End If
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Documento senza titolo</title>
</head>

<body>
<form ACTION="<%=MM_LoginAction%>" id="frm_login" name="frm_login" method="POST">
<table width="100%" cellspacing="5" cellpadding="3">
<tr>
<td>mail</td>
<td><input name="username" type="text" id="username" /></td>
</tr>
<tr>
<td>psw</td>
<td><input name="pwd" type="password" id="pwd" /></td>
</tr>
<tr>
<td></td>
<td><input type="submit" name="Submit" value="Invia"/></td>
</tr>
</table>
</form>
</body>
</html>