Business Object Login Screen Coming up

BO XI 3.1 is integrated into our .net application successfully. We are using Enterprise Authentication by generating tokens on our aspx page to authenticate users. The issue is that if user leave their browsers open for long period of time and then try to access any BO report from our application, it tries to open the OPENDOC but then goes to BO Login Screen.

We generate a new token every time a user tries to view any BO report on our application. But the problem is if the browser is left behind open for long (usually overnight), then this error must happen even though a new token is generated while trying to view this report. And if user closes this browser and opens a new one, then the report runs just fine.

We have tried to keep the token into session and cookies both and have tried to kept it alive for one full day as well but this error is not going away.

Any help is appreciated.

Thank you,