Unable to Register OData service in Gateway

Hi,

I Created OData service in my ERP (ECC EHP7) box.

But I am unable to register that service in the Gateway Box.

Every time I can register the service in the ECC box itself.

I want to register the service in my NW Gateway box.

I think I am missing something at System Aliase.

Do I need to create system aliase in my ECC as well as NW box.

Thank you.

Ravinder.