This doesn't answer the question about the issue you are seeing about the listener not being able to start. I can only think that two services are trying to bind to port 80, maybe something in the proxy settings need to configured differently. Configuration -> Appliances -> Proxies.
However to check the health of your system, there is an article that goes over the options to monitor the health and alert when configured thresholds are met:
I hope that helps and best of luck!
I've just tried incident notification ruleset and follow the guidance since yesterday but i have problem when apply the changes with error Parameter "list": Parameter is list "com.scur.type.regex.351" is missing.
Do i miss something?