I wanted to use the REST Service in an application. So when I add the service reference in Visual Studio I get this error
There was an error downloading '
http://myMainSite/sites/subSite/_vti_bin/ListData.svc
'. The request failed with HTTP status 400: Bad Request. Metadata contains a reference that cannot be resolved: 'http://myMainSite/sites/subSite/_vti_bin/ListData.svc
'. The remote server returned an unexpected response: (400) Bad Request.
When I access the Service-URL in the browser I get the definition xml