Logon Screen when opening WEBI

Hello Experts,

I am opening a WEBI report from xCelcius dashboard. When I do this, the sytems asks me for logon credentials again. Even after entering valid credentials, it keeps asking for logon credentials. I am using IE 8.0 for viewing dashboards and WEBI. This is happening with only 1 particular webi. Other webi opens properly. Can someone help me in finding out the issue?

Thanks in advance for the help

Regards

Sandeep Patil