Thanks a lot a lot OM_PRAKASH because with your useful link I have solved my problem
The code remains the same:
here I put the only variable that returns remote hostname that submits or opens the server page.asp
<%@ Language=VBScript %>
<% Option Explicit %>
<html>
<head>
<meta http-equiv="Content-Language" content="it">
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>AAA</title>
</head>
<body>
<pre>
<%=Request.ServerVariables("REMOTE_HOST")%>
</pre>
But BEFORE we have to do these things on the Server:
1. open DOS window:
2. go to folder
C:\Inetpub\AdminScripts
3. write this sintax:
CScript.Exe adsutil.vbs set w3svc/EnableReverseDNS TRUE
in this way is set not the IP adress to be received, but the hostname
