Session Expired be4 timeout Plz Help me urgently

[net4matrimonials]

I m using session veriables of asp.net on two websites
www.net4professionals.com(job site) and www.net4matrimonials.com
(bride/groom service)

when i create a session on page A i use codeing
session.timeout=180
session("name")="xyz"
response.redirect("myaccountpage.aspx")

on page B to access session variable i use
sub onpage_load
label1.text=session("name")
end sub

but on myaccountpage.aspx the session expired within 10-20 minutes
inspite of 180 minutes

plz help me urgently on net4professionals at yahoo dot com