For SNMP agents you need to correctly set you settings, you need to be allowed to access the server in the SNMP config. You also need to know and set the community string in SIM under the credentials settings. Then you need to be able to access the server trough firewall(s).
If you use WBEM tou need an Admin account to access the server and then again the firewall ofcource. Try to avoid to use both at the same time.
SNMP needs to have traps configured in the SNMP settings and when using WBEM you need te set a WBEM subscription from SIM. A trust is not needed from a monitoring perspective, only if you want to be able to passtrough from SIM. If you use a GEN8 or newer you should not install WBEM/SNMP agents or SMH.
If you use WBEM tou need an Admin account to access the server and then again the firewall ofcource. Try to avoid to use both at the same time.
SNMP needs to have traps configured in the SNMP settings and when using WBEM you need te set a WBEM subscription from SIM. A trust is not needed from a monitoring perspective, only if you want to be able to passtrough from SIM. If you use a GEN8 or newer you should not install WBEM/SNMP agents or SMH.