Are you experiencing the issue with only one of the managed nodes or all of them? If it is just one of the nodes, it might be worth check what the configuration on the iDRAC looks like for SNMP trap forwarding.  In certain unique scenarios where the trap forwarding configuration table is full we are unable to configure it and might see an error similar to the one you are describing. If the issue is only a single discovered node, you can also try to configure the alert destination of a server manually.  This is explained under “Manually configuring SNMP settings” in the User’s guide. However, if the issue is across all nodes, it looks more like a general firewall/proxy issue and should be addressed with your IT networking team.  The SupportAssist user guide describes all the ports required and there are no other ports required other than what is described in the User’s guide.
I have read the documentation and that says that the iDRAC ports 161/udp and 443/tcp need to be opened in order for SupportAssist to monitor these devices. These ports are open, but when I try to add an iDRAC to the console it fails saying that portscanfailed: reason The required ports are not open. What ports need to be opened for successful communication between the SupportASsist server and the iDRACs.  This is SupportAssist enterprise v1.0.
What ports need to be open on iDRACs.