In order to enable Host Discovery support in NormShield, after installing the NormShield agent through NormShield HotPoint, configuration settings under Host Discovery tab should be adjusted.
Enable Host Discovery checkbox should be selected for enabling the feature. Nmap is used for host discovery scanning and scan parameters can be adjusted at one's leisure. There are different ways of understanding if a host up or not.
After everything is good, don't forget to hit the SAVE button.