AWS Rekognition

In my cloud DF, the AWS Rekognition SDK seems to be installed in Services and the API-DOCS seem to appear properly. When I TRY the LISTCOLLECTIONS, I receive this error, although the URL shown in the error is a mere snippet of the BASE URL entered in the service, and the SERVICE DEFINITION. “error”: { “code”: 6, “context”: null, “message”: “Couldn’t resolve host ‘rekognition.amazonaws.com’”, “status_code”: 500 }