I've created a custom poller in the Orion Universal Device Poller console, which uses the Cisco-Unified-Firewall-MIB:cufwConnGlobalNumActive (OID 1.3.6.1.4.1.9.9.491.1.1.1.6). I've got a test firewall to poll against which test successfully within the Universal Device Poller, but when I assign my test firewall to this poller, I never get any data in Orion. What else should I be checking?