Then my question is what's the port for the Default Services in the gateway's Profile Repository for? what I am referring here is the port under Oracle Enterprise Gateway - Dashboard >This is for changing a particular "Profile". If you make a change to the port here in a "Listeners" profile, then you will see that there is now an asterix (*) on the name of the profile. you can right-click on it an "version" it. Then back on the deployment tab, you can drop-down the Listeners profile list, choose the new version you've just registered, and press the "Deploy" button (in the bottom-right) to deploy this to a Gateway. This approach is if you want to create a specific Listeners profile which you want to push to a particular Gateway (or group of Gateways).
Profile Repository> My Configuration Profile > Oracle Enterprise Gateway > 6.1.2 > Listeners > Default Listerners Store