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Excel services and PowerPivot error: “Unable to refresh data for a data connection in the Workbook. ”

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Hi Team,

My environment is a 3-tier SharePoint 2010 Architecture: Running on SQL Server 2012 Enterprise Edition

WF1
WF2

Both Web Fronts are NLB, and we have they following Application Servers

APP1 - Dedicated for Search Service (Query and Indexing Component).
APP2 - Has been configured to run all the BI services - i.e. PowerPivot, Excel, Secure Store, Claims to Windows Token, Visio Graphics, and BCS.

SO far I tried the following (and I get the error message - see in brackets):

1. Have Excel, Secure Store, and Claims to Windows Token running on both Web Front Ends and Application Servers (Error I recieve: "Unable to refresh data for a data connection in the Workbook. Try again or contact your system administrator. The following connections failed to refresh: Data")
2. Have Excel, Secure Store, and Claims to Windows Token running on WF1 and APP2 only (Error I receive: "Unable to refresh data for a data connection in the Workbook. Try again or contact your system administrator. The following connections failed to refresh: Data")
3. Changed Claims to Windows Token service to run as a Local System
4. Data Location has been added as a Trusted Data Location.

Do you guys have a clue why is this happening?

I spent the entire day Yesterday swapping services between the servers but I still cannot go through.

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