era già postata,cmq è questa:

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

ora xò l'ho già sostituita con quella che mi ha detto roby:

<%
Dim DBConn
Set DBConn = Server.CreateObject("ADODB.Connection")
strConn= "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Server.MapPath ("/database/db_prova.mdb")
DBConn.Open strConn
DBConn.Close
Set DBConn=Nothing
%>

ma mi da questo errore:

ADODB.Recordset error '800a0bb9'

Gli argomenti non sono di tipo valido, non sono compresi nell'intervallo consentito o sono in conflitto.

/Default.asp, line 14

e la linea 14 è questa:

MM_rsUser.ActiveConnection = MM_conn_prova_STRING

del codice della pagina di login che completo è questo:

<%@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
%>