Deployment from Dashboard Designer doesn't work

Hi,

I want to deploy a dashboard to a Project Server 2013 instance.

The instance was migrated from Project Server 2010.

But I get the following error : An error has occured attempting to contact the specified SharePoint Website. Please check the connection and settings and try again.

The weird thing about it is that the deployment works on another instance of the same SharePoint Site.

So the problem doesn't come from SharePoint 2013, but from an upper layer.

Do you have any idea why does the deployment fail on a migrated instance? 

Thanks,

Corentin