Hello,
What protocol do you use to discover the server? Could it be that you only have wbem discovery?
Wbem and SNMP should be enabled, the traps you receive are SNMP so if you don't have SNMP credentials to discover the server you could be missing some info. If you logon to the SMH of ghr server you mention does it have SNMP or WBEM as a dataprovider? (You can see this at the top of the SMH of the target server)