We have upgraded TFS 2012 to TFS 2013 and did not have sharepoint installed before. So i installed tfs sharepoint components on a sharepoint server and tfs server and connected them. Everything is fine except excel reports and they give me the following error:
External Data Refresh Failed
The data connection uses Windows Authentication and user credentials could not be delegated. The following connections failed to refresh: TfsOlapReport
i have made sure Claims to windows authentication service is running.