So that's your problem then right? If you run a repair for your servers from the configure menu. The option is Configure or repair agents. You need a windows admin account for this. Set the set webrm subscription and set SNMP trap with the SIM server as the destination.
If this has run do a test run. Now in case of SNMP event you should get the traps within 20 seconds.
If this has run do a test run. Now in case of SNMP event you should get the traps within 20 seconds.