I've a report that has a multi-valued parameter. when I publish the asp.net app and call it from a browser, the report returns with the null combo/drop down for the multi-value parameter. That is the element exists but it is null. If I call the report directly the reportserver using the browser...no problem. I suspect this is a permission/access control issue. I tried setting default values for the report but no change. Anyone have insight? Note that the ASP.NET site is on a different machine than the report server. The problem only occurs when using the reportviewer.