SharePoint 2010 W/ SSRS Integration (Reports are running under the same account)

TDSUSER used Ask the Experts™
I have a SharePoint 2010 Portal configured with SSRS Integration (Split between two servers, frontend web and a backend SQL Server 2008 R2 Database Server). Permissions set are NTLM, I have also tried Kerberos authentication. The Reports are supposed to only display data for the logged in user (within the report we used the Parameter "User!UserID")

Within SharePoint, the reports are all running under SharePoint service account. For some reason the SharePoint userid is not being passed to the report parameter.
Any help would be greatly appreciated!
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I got it working, after using the following a white paper i found on Microsoft about Double Hop   Kerberos authentication in a SQL Server 2008 Reporting Services

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