Login - Timed out, asp, ms acsess, vbScript

i want to make a login session for 20 minutes
 
if i wrote the following code, then it is giving the dafault value is 20
[CODE]<%
response.write("<p>")
response.write("Default Timeout is: " & Session.Timeout)
%>[/CODE]
But my system is asking for login in an average after 2 or 3 minutes.
so, what should i do?
Please help me.

write out the session ID to see if a new session is being created.

 Place this code in the header file and you can find the problem page.

No, new session is not going to be create.