HANA Cloud Platform - call external R Server

Hi,

we have an external R Server, that we successfully can call through HANA Studio (RLANG integration). But from XS we get an internal Server Error 500 (GET Method) due to that the XSJS service doesn't get a result back. The xsengine.ini has the appropriate calcengine section (which has been successfully tested on AWS).

Do you know what we have to consider in configuration of the HANA Cloud Platform (Port, etc.)?

Thanks.

Alexander