SmartSense Service Unavailable after ambari upgrade

[#1]

SYMPTOM: Recently, we upgraded from Ambari 2.1.2.1 to Ambari 2.2.2.0. Now, we also would like to utilize „Smart Sense“.

Per Ambari status it is running. But when opening the „SmartSense“ View we are receiving following error:

ERROR:

SmartSense Service Unavailable The SmartSense service is currently unavailable. Please make sure the SmartSense Server is up and running. 

ROOT CAUSE:

Customer was having problem with DNS registry, hence it was giving issue.

RESOLUTION: Using ipaddress instead of hostname resolved the issue.

[#2]

What do you do for the for the other 99% of the time when you get this error and DNS is not the isse?