Crystal Reports Crystal Report & SQL Server Windows Authentication

Message

   HI All!

I am having trouble using Windows Authentication with Crystal report.

I have web Application that will display the report on the browser at runtime

It works fine when I used Sql server authentication, but we need to support windows authentication as well.

And when i am trying to do Windows Authentication, it is prompting me again and again for DB creadintials.

If I give the windows Domain user credintials it works, I don't really understand why it is not working without userid and pass.

But the same is working if am using it on windows desktop application.

I would like to know is it possible to work with crystal reports using windows authentication on web application?
I am using VS 2010 & CR run time 13.0