Hi Kapil,
I'm not really an expert for the Cloud Connector, but just in case you are looking for documentation. Here is the link to the official one for the Connectivity Service.
The section Connectivity for SAP HANA XS (Trial) says:
Currently, you can make XS destinations for consuming HTTP Internet services only.
So I'm, afraid it looks like what you are trying to do is not possible with a Trial instance.
If you are developing in a productive instance, you can do this, but you need to install the SAP HANA Cloud Connector on an on-premise system which can reach your backend server via the required protocol.
Best regards,
Oliver