Always create a ‘classic-mode’ web application for PowerPivot in SharePoint 2010

We recently created a new web application on our SharePoint farm, we chose claims-based authentication as authentication option. All seemed ok until i wanted to create a report on top of the PowerPivot application in SSRS. I got a error “‘Too many automatic redirections were attempted” in the report builder 3.  Searching on the Internet i can across a blog of Dave Wickert that explains that we need to run a PowerPivot web application in classic mode: Why PowerPivot requires ‘classic-mode’ web applications.

Unfortunately we cannot  change back classic mode from a claims based web app. So we had to create a new webapplication and copy everything from one site to the other (or create a backup of your sitecollection and restore it in a new web application.

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