LinuxMonitor working, but OpManager doesn't think so!

Hi!

I've just installed the LinuxMonitor SNMP agent on a Linux box next to my desk. It's on the same subnet as the machine running OpManager and has no firewall.

I can browse to the LinuxMonitor web interface on port 8040 and all looks fine, however when I try to test an SNMP monitor from OpManager, say Disk Utilization, OpManager claims "The Monitor did not respond to the test request". OpManager confirms that the machine I'm trying to monitor is SNMP enabled as it has a little blue star next to it in the map view.

Is there something else I need to setup in LinuxMonitor (or elsewhere) before I can use SNMP based monitors from within OpManager?

Thanks,

Steve