AIX SNMP Monitoring

I try to monitor an AIX 5 with SNMP, I have uploaded the mib for AIX, and I can test it with the MIB browser.

Here is for exemple the monitor for CPU Utilization with the MIB browser:

SNMP V1/V2
Object OID : .1.3.6.1.4.1.2.6.191.1.2.1
Community : public
result of GET : aixSeCPUUtilization.0:-->3

Then I have Added SNMP monitor to my AIX template, but I cannot make it working. When I try the Test Monitor from the Server Device I get :

The Monitor did not respond to the test request

I have notice with the test monitor that OID end with .0 (.1.3.6.1.4.1.2.6.191.1.2.1.) so I try the create the monitor in Bulk mode without the .0, not working.

Before I try to debug with a TCP/UDP packet analyzer, is there any other option I can try ?