Hi Praveer,
You would need to maintain the system details in the below screen. The best way to get the correct value of host/port is to test the service from the ABAP backend system using tcode /IWFND/MAINT_SERVICE. It will launch the service in the browser and you could use the value of Host and port from URL (ex- http://<hostname>:<port>/sap/opu/odata/sap/Z_SALESORDER_SRV). Make sure you use the Fully Qualified domain name.
