Odata Issue in Browser

Hello Experts ,

I just want to clarify one thing regarding the Gateway service we developed using a hub approach . As we test our service in Gateway client using standard logon procedure , it is working as expected and showing the result . But when we test the service from Browser IE & Firefox , it is throwing error as “RFC call ended with system failure exception” as shown below. I am just wondering why a service is returning 2 different results .  Is there anything related to RFC Destination for http/https which might cause these type of errors ? Do we need to do any other settings in SICF for a service .

Could you please throw some light on this issue .

Appreciate your help.

Thanks.