Unusual Webi Error

Hi all,

I have an issue occurred after refreshing the webi.

The situation is that once I open the webi and refresh the data, it is fine and successfully retrieve data.

However, after the report has been idle for a long time (20 minutes or longer), the report cannot retrieve data after clicking the refresh button and then prompt the error

Anyone has idea?

ps. using BO 4.1 SP5 , OS is AIX 6.1, web app server is Websphere

Thanks,

Marc