Applicable for cases where there is a Fortigate Firewall between the Load balancer and the vRealize Automation cluster nodes.
FortiGate firewall has service interface listening on 8008 and 8010 ports. In case there is a FortiGate firewall between the load balancer (of all kinds) and the vRealize Automation nodes, the monitoring would send requests to the port 8008 of the firewall and thus become invalid.
The obvious solution is to change the configuration of the FrotiGate firewall so it wouldn't listen on 8008.
Any other solution (like creating a DNAT on the firewall and chaning the above mentioned best practice settings) would be considered unsupported and should be performed at personal risk