Parameterized Report And DataSource Security

Hello.

I am trying to render a report that I set up with SSRS 2005 from an existing .Net web application. The report takes in a multi-valued parameter (sequenceNums) and displays data accordingly.

This is the url I am passing from the web application:




Code Blockhttp://myservername/ReportServer/Pages/ReportViewer.aspx?%2fProjectDBReports%2fCriticality&rs:Command=Render&rc:parameters=false&sequenceNums=4299,4312





Upon redirect, I receive the following error "one or more data sources is missing credentials"

I currently have the following connection settings checked for the DataSource used in the report:
- connect using credentials supplied by the user running the report
- use as windows credentials when connecting to the DataSource

When I attempt to view the report with no parameters being passed in, the report renders properly and I receive a prompt asking me for my credentials.

Do I have to connect to my DataSource using credentials stored securely on the report server?

Thanks in advance.

Sam

ps - i included the url within a code block so no smiley faces would show