We have been adding a large number of 2k3 servers and have had trouble polling them via SNMP. Out of about 300 that we've tried to add, roughly 50 of them went through perfectly by simply adding them to the Security tab of the SNMP Service as an allowed poller. For the rest of them we had to add our Orion server as a trap destination before it could ever poll it....
We've accepted that as odd and moved on. However, every morning I come in to find that a dozen or so servers have "dropped off the map" and now can't be polled. If I restart the SNMP service on the W2k3 server, everything pops up again and starts working. This appears to be completely random and happens to about a dozen servers a day.
Any thoughts? We currently have 811 nodes, 2766 interfaces being monitored.