I'm continuously getting the 500: Illegal port command, bind already in use

But I have an other question too, when I push the changes,

confirm_server_listening : passed
confirm_client_server_communication : failed
confirm_external_client_server_communication : passed

how come that external_client_server_communication assessment got passed and not the second one?
Ideally the first and second one should pass as I was working on module 3 milestone 2.

use only the options that are provided within the config file, no need to add new options.

okay, I will make the required changes. But an you please resolve the above mentioned doubt?