I've just installed a small SNMP graphing program on my Mac notebook however I can't seem to get it to show any results. It says "no SNMP response"

It hit my firewall trying to access "LockBox.local" which is my Airport router, so I let it through. But still nothing. I set its prefs to the LAN IP of the router (which I can ping quite successfully) and nothing.

I thought I'd try this out first before going the route of figuring out a more full featured program to run on my Windows server.