Changing the protected environment alias, through CA Identity Manager Management Console, in environment properties page, and after saving the changes and restart the environment, both aliases (the old and the new one) are still active and responding to the requests.
Identity Manager 14.x
The configuration was reloaded using the "Stop / Start" and "Restart Environment" buttons from Identity Manager Management Console.
After changing the Alias property, stop and start the Identity Manager service instead of using the "Stop/Start" or "Restart Environment" buttons from the Identity Manager Management Console.