I'm using the HTML5 Report Viewer. Everything seems to be working fine but when I refresh the report using the refresh button on the Report Viewer, I get a 404 error. From what I saw in Fiddler it looks like when I hit the refresh button its called the DeleteInstance action on the base controller. The call looks like this mysite/api/reportsdata/clients/154459-b20c/instances/163052-40f7 I'm hoping someone can shed some light on this issue.