Operating System Tab in SMH is missing most items

[T.Willmann]

In SystemManagementHomepage under "Operating System" tab are most Items missing. Only
"Processor Utilization" shows.
Only in rare cases I see all items , until I login , they disapear again.
This problem we saw on 3 out of 25 servers.
Also the "System Model" shows "unknown"
If I compare installed software and agents for SIM between good and bad servers I can't find any difference. All services are up and running. No strange error in any event logs.
Any hint ?

Thanks

[David Claypool]

Almost always mis-configured SNMP. Use 'Configure or Repair Agents' in HP SIM to automatically correct these problems.

[Tom Whiteley]

I found that changing the SMH Data Source (in the Settings tab on the local server's SMH) from WEBM to SNMP did the job... Obviously make sure your Windows SNMP service is installed, running and configured on the server too.