Problem

-- Connection to API Manager interface is secure by default.

-- Is it possible to remove SSL/TLS on the listener to be able to connect to API Manager on a clear connection?

Resolution

- This is not possible. When loging to API Manager, a session cookie is created, which is send only over HTTPS session. If there is no SSL/TLS on the connection, after being log, the cookie won't be send by the browser (secure only option) and API Manager won't know you are logged, so will ask for login again.