I know this isn't ConfigMgr specific but since SCE 2010 has some ConfigMgr features I thought I'd post here just as a quick FYI.
When you monitor some Simple Network Management Protocol (SNMP) devices by using System Center Operations Manager or System Center Essentials, the monitoring may stop intermittently. This issue affects the SNMP performance collection rules or the SNMP event monitors.
After you restart the OpsMgr Health service or the System Center Management service on the proxy agent, the monitoring of the SNMP devices continues as usual for a while. However, this issue may again occur sometime later.
Additionally, the following event is logged in the Operations Manager log when this issue occurs:
Event ID: 4000
Task Category: Health Service
Computer: computer name
A monitoring host is unresponsive or has crashed. The status code for the host failure was 2164195371.
Note This issue occurs on a computer that is running any version of System Center Operations Manager or of System Center Essentials.
One or more of the following Operations Manager 2007 events may also be logged on the proxy agent when this issue occurs:
Source: Health Service Modules
Event ID: 1101
Description: Error sending an SNMP GET messages to IP Address NN.NN.NN.NN , Community String:=communitystringname, Status 0x63
Event ID: 4503
Description: A module reported an error 0x80004005 from callback which was running as part of a rule “rulename” running for instance “NN.NN.NN.NN: with id:”GUID” in management group “managementgroupname”
Event ID: 1101
Description: Summary: N rule(s)/monitor(s) failed and got unloaded, N of them reached the failure limit that prevents automatic reload. Management group “managementgroupname”. This is a summary only event, please see other events with unloaded rule(s)/monitor(s).
For all the latest information including how to download the hotfix see the following Knowledge Base article:
KB982501 - The monitoring of SNMP devices may stop intermittently in System Center Operations Manager or in System Center Essentials
J.C. Hornbeck | System Center Knowledge Engineer