Hi All,
i am using Asp.net with sql server and C#

In my application i am using windows authentication.

In one page there are so many calculation and data because of this my page takes a lot of time to load(max 5 min).
when i saving th data or when I do any action it open a popup window in that it's again asking user credentilas.(in my case when i click the check box i need to perform some calculation and populate the data in this case i am getting this pop up)

in the development server working fine.
but in the production server we are getting some popup window in that it is asking for user credentials.

in the web.config file session timeout i put 30 min

what is the problem.

please this very urjent.
please help me out

thanks in advance

jayapradha