PowerPivot - refresh excel with Data Feed

Question

Dear all,
I created a PowerPivot chart out of a SharePoint exported list to Data Feed.
I then published it to a trusted Document Library.
The Chart is working well but is not updating.
So if I go to the document library and on the drop down meny of the publsihed excel file I choose Manage PowerPivot Data Refresh and force it to refresh, it fails with the following error message>
Errors in the high-level relational engine. The following exception occurred while the managed IDbConnection interface was being used: The remote server returned an error: (401) Unauthorized.. A connection could not be made to the data source with the DataSourceID
of '3b4d4c28-909c-47d3-b4d6-07684f5e2ee9', Name of 'DataFeed mywebapp.domain TestPowerPivotDataFeed'. An error occurred while processing the 'testPowerPivot' table. The operation has been cancelled.
On the SQL Server I ran a profiler and got the follwoing:
exec [DataRefresh].[AddRunDetails] @RunID=54,@DataSourceID=N'3b4d4c28-909c-47d3-b4d6-07684f5e2ee9',@FriendlyName=N'DataFeed mywebapp.domain.local TestPowerPivotDataFeed',@Source=N'http://portal.gonzofish.local',@Provider=N'Microsoft.Data.DataFeedClient',@Catalog=N'dev/scrum/Data
Feed Library/TestPowerPivotDataFeed.atomsvc',@ConnectionString=N'Data Source=http://mywebapp.domain.local/dev/sc/Data%20Feed%20Library/TestPowerPivotDataFeed.atomsvc;Integrated Security=SSPI;Persist Security Info=false;Namespaces to Include=*;Service Document
Url=http://mywebapp.domain.local/dev/sc/Data%20Feed%20Library/TestPowerPivotDataFeed.atomsvc',@Result=N'F',@RunStartTime='2014-06-04 15:33:04.590',@RunEndTime='2014-06-04 15:33:04.727',@Comments=N'Errors in the high-level relational engine. The following exception
occurred while the managed IDbConnection interface was being used: The remote server returned an error: (401) Unauthorized..
A connection could not be made to the data source with the DataSourceID of ''3b4d4c28-909c-47d3-b4d6-07684f5e2ee9'', Name of ''DataFeed mywebapp.domain.local TestPowerPivotDataFeed''.
An error occurred while processing the ''testPowerPivot'' table.
The operation has been cancelled.
I followed the link http://technet.microsoft.com/en-us/library/hh487291%28v=office.14%29.aspx to set up the Data Refresh for the PowerPivot.
Thanks in advance.
Regards,
Gonçalo
Gonçalo

Answer 1

http://social.technet.microsoft.com/Forums/windows/en-US/082a62f2-77b6-41c9-be94-09cf06622d4e/powerpivot-refresh-error-on-workbook-using-a-data-feed-from-sharepoint-list
You configured the PowerPivot unattended data refresh account, but now data refresh is failing. Check for these possible conditions:
Choosing the wrong credentials option in the schedule data refresh page.
Insufficient permissions on remote computers or data sources.
Follow the steps below to re-add the unattended data refresh account and see how it works:
1. Create a Data feed library .
2. Upload the local copy of you data feed to there.
3. Open up your report and change the connection.
4. Use Secure Store Service by adding your unattended PowerPivot refresh account.
If still no help, for quick and accurate answers to your questions, it is recommended that you initial a new thread in our SQL server forum.
SQL server forum
http://social.technet.microsoft.com/Forums/en-US/home?category=sqlserver
Meanwhile, there are some articles about troubleshooting PowerPivot data refresh issue for your reference, please see:
Troubleshooting PowerPivot Data Refresh:
http://social.technet.microsoft.com/wiki/contents/articles/3870.troubleshooting-powerpivot-data-refresh.aspx
http://technet.microsoft.com/en-us/library/gg399164.aspx