Hi Tony, some customers had issues with this when they didn’t upgrade the Java version they were using. Can you confirm you are using at least Java 9? If you are using an even newer version up to 11, you need to point Engine to the correct version of Java you are using.
Also for the balancer, you can check and confirm the IP address your local host is resolving to is correct.
There could a wide variety of reasons it’s not working when you upgraded from the ports to custom modules to the server listener configuration, In order to accurately diagnose the cause, we’d need a support ticket to further investigate.