Monthly Archive: January 2015

Jan 20

Network Connections dialog empty / teaming “Host Unmanageable” – fix

I’ve run into this with increasing frequency in my Server 2012R2 clusters, and it ended up being WMI corruption. IPConfig would show correct IP addressing (and even the teamed NICs created with Windows teaming), and ping would work; however, the network connections dialog box (ncpa.cpl) was completely empty, Server Manager said teaming was disabled, launching the teaming administration page (lbfoadmin.exe) would show “Host Unmanageable” as the status, and attempting to make any connection to any other machine other than ping would result in failure (for example, \\server\share would fail immediately with the host being unavailable).

Here are the steps I needed to use to get the machines up and running again (and I’ve restored from failed backups on a few to test and retest these steps, and in this particular order which did seem to matter, to validate):


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Jan 12

Make WMI more robust to large volumes of queries

Ever had a machine where WMI stopped working properly and needed to be rebuilt? ¬†Was it running¬†something that does high volumes of WMI calls (like System Center agents, or Tivoli, or HP OpenView (to name a few regular problem children – I’m sure you can think of more)?

Here’s a PS script I run to increase memory per WMI process (and globally across the machine) available to WMI, as well as modifying it in the boot order (if you rely on RSOP, WMI’s default configuration means it’s possible it won’t be completely loaded properly when Group Policy runs, and can cause RSOP issues, amongst other things).

$oWMI=get-wmiobject -Namespace root -Class __ProviderHostQuotaConfiguration

Set-ItemProperty -Path HKLM:\SYSTEM\CurrentControlSet\Services\Winmgmt -Name 'Group' -Value 'COM Infrastructure'
winmgmt /standalonehost


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