The trusted location where the workbook is stored does not allow external data connections. The following connections failed to refresh: PowerPivot Data
For Excel workbooks that contain PowerPivot data, Excel Services returns this error if it cannot connect to embedded data sources.
PowerPivot workbooks contain embedded data connections. To support workbook interaction through slicers and filters, Excel Services must be configured to allow external data access through embedded connection information. External data access is required for retrieving PowerPivot data that is loaded on PowerPivot servers in the farm.
Change the configuration settings to allow embedded data sources.
In Central Administration, in Application Management, click Manage service applications.
Click Excel Services Application.
Click Trusted File Location.
Click http:// or the location you want to configure.
In External Data, in Allow External Data, click Trusted data connection libraries and embedded.
Alternatively, you can create a new trusted location for sites that contain PowerPivot workbooks, and then modify the configuration settings for just that site. For more information, see Create a trusted location for PowerPivot sites.