Expose dashboard data sourced from SQL SSAS into Sharepoint using Excel Services

Hi:

We are trying to expose dashboard data sourced from our SQL SSAS server into SharePoint 2010 using Excel Services.  In SharePoint 2010, I visit the Excel Library and choose one of the excel files we created and placed there, it opens correctly within Sharepoint, however when I click on "Data>Refresh all connections" we receive this error:

"The data connection uses Windows Authentication and user credentials could not be delegated.  The following connections failed to refresh:   "Data Connection Name (the name of the data connection we have stored in the "Data Connections" SharePoint Library".

We suspect that we need to implement kerberos, however we would rather not. 

SQL SSAS/SSRS are loaded on a seperate server from SharePoint 2010 Enterprise, but are both within the same domain. 

We would like the information displayed to be based on the user logged into SharePoint.

Help!!!

Thanks,

Stangride