Edit discovery.conf in “C:\Program Files\System Center Operations Manager 2012\Server\NetworkMonitoring\conf\discovery” location:
Remove “#” before “DebugEnabled = TRUE”.
Add line “LogDiscoveryProgress = TRUE” below the DebugEnabled = TRUE.
Restart the Health service on management server.
Run network discovery. Wait for to complete.
Read log “ManagementServer-FQDN.log” from location c:\temp on the Management Server…