I am trying to render a report in the HTML5 viewer but see a "Unknown report server error".

Checking the Network tab in IE9 tools, I see that is sends a request POST /ReportService.svc/ajaxAddress/CreateSessionForReport HTTP/1.1 with a request body of:

{"reportSource":{"ReportUri":"/Reports/SiteList.igr"},"settings":[{"Key":"systemDpi","Value":96}]}

The response body is a Fault with embedded

DestinationUnreachable

I am using ASP.NET, MVC4.

Any ideas?

Thanks