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The admin console crashes multiple times per day or perhaps the customer is unable to open the admin console. Sometimes the error displayed is 1612 (lost connectivity) or 1700 (during a refresh). These are only symptoms and not the underlying problem.
In the VM Manager event log, the following events are logged:
Log Name: VM Manager Source: Virtual Machine Manager Event ID: 19999 Level: Error Description: Virtual Machine Manager (vmmservice:6296) has encountered an error and needed to exit the process. Windows generated an error report with the following parameters: Event:VMM20 P1(appName):vmmservice P2(appVersion):2.0.3444.0 P3(assemblyName):E.Adhc.Operations P4(assemblyVer):2.0.3444.0 P5(methodName):M.V.E.A.VirHostDatabaseUpdater.PostVirtualNetworkUpdate P6(exceptionType):System.NullReferenceException P7(callstackHash):d1e7
Log Name: VM Manager Source: Virtual Machine Manager Event ID: 1 Level: Error Description: System.NullReferenceException: Object reference not set to an instance of an object. at Microsoft.VirtualManager.Engine.Adhc.VirHostDatabaseUpdater.PostVirtualNetworkUpdate(Dictionary`2 nics, List`1 dbNics, SqlContext ctx) at Microsoft.VirtualManager.Engine.Adhc.HostDatabaseUpdater.UpdateDatabase() at Microsoft.VirtualManager.Engine.Adhc.HostRefresher.UpdateAllInformation(Host host, HostUpdateInformation hostUpdateInfo, Guid taskID) at Microsoft.VirtualManager.Engine.Adhc.HostRefresher.RefreshData(HostReference hostRef) at Microsoft.VirtualManager.Engine.RefreshDriver`1.RefreshThreadFunction(Object obj)-2147467261
This issue occurs if the Virtual Machine Manager Server or Hyper-V host that's being managed by Virtual Machine Manager is reporting 2 NICs with the same name. This issue is a known bug that will be corrected in the next version of VMM.
The workaround options at this point can be:
Update the network card drivers in the hope that it resets the names.
Avoid binding virtual networks to either of the duplicate NICs.
Disable all but one of the duplicate NICs on the host.
Disable host refresh and only do on-demand refresh (for all hosts but the affected one).
Don’t manage the host with VMM.
Note Another potential cause has been reported that if the Host has NIC teaming enabled this issue can occur.
Determine which Host is experiencing the problem and remove the ghosted NIC. Either of the following methods will work.
Use the devcon utility which can be downloaded from KB311272. After installing devcon, open a command prompt and navigate to the directory where it’s located. Then run the following commands.
devcon listclass net devcon findall =net
The output should be identical. If not, then any additional devices will have to be manually deleted from the Host.
An alternative can be to use the following command:
An alternative solution to remove the ghosted device is as follows:
a. Click Start, click Run, type cmd.exe, and then press ENTER. b. Type set devmgr_show_nonpresent_devices=1, and then press ENTER. c. Type Start DEVMGMT.MSC, and then press ENTER. d. Click View, and then click Show Hidden Devices. e. Expand the Network Adapters tree. f. Right-click the dimmed network adapter, and then click Uninstall.
For additional information on this process, please refer to KB269155.
This issue is resolved in Microsoft System Center Virtual Machine Manager 2008 R2.
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