We mentioned a few months ago the Dell Management Pack issues running on Operations Manager 2007 SP1. As it turns out, Microsoft discovered an issue SNMP networking module that causes the HealthService to become unstable when there is a rule configured to use SNMP within a discovery. They  have developed a  hotfix to  address the problem.

Where to get the fix:

The fix is described in KB951526. I do not see this KB on the MS support site yet, so call Microsoft support to obtain the fix.

NOTE: The patch applies to System Center Operations Manager 2007 SP1 only

Symptoms

You will see this event in the Operations Manager event log on the server that has the rule which is using our SNMP networking module in a discovery rule:

Event Type: Error

Event Source: HealthService

Event Category: Health Service

Event ID: 4000

Date: 4/22/2008

Time: 1:32:13PM

User: N/A

Computer: OPSMGRSRV1

Description:

A monitoring host is unresponsive or has crashed. The status code for the host

failure was 2164195371.

For more information, see Help and Support Center at

http://go.microsoft.com/fwlink/events.asp.

Affected Files

This hotfix impacts the following installed files: MomNetworkModules.dll (Version 6.0.6278.24)

Additional Information

For additional information about this issue, see KB article KB951526 at <http://support.microsoft.com/>. For additional information and downloads, see <http://www.microsoft.com/mom>.