SNMP is not working and you have allowed all of the snmp_ps denied events you found in the logs but SNMP is still not working on your Data Center Security agent running IPS.
Add the following keys as writeable in the snmp sandbox. \REGISTRY\MACHINE\SYSTEM\*ControlSet*\Services\EventLog\Application\HostMIBAgent \REGISTRY\MACHINE\SYSTEM\*ControlSet*\Services\WinSock2\Parameters\* \REGISTRY\MACHINE\Software\Microsoft\Windows\CurrentVersion\Explorer\Performance \REGISTRY\MACHINE\Software\Policies\Microsoft\Windows\System