Ok, first of all one point to be clear although there exists an ABAP RFC connection, yet the channel is not RFC. You can be clear on this from the Adapter Type. It should have been RFC.
Secondly for your case, it is mentioned Addressing Type as URL. So in the Path section you should give the URL of the ECC system. You can get this from App server name under properties in SAP Logon screen.
Regards,
Souvik