Event ID 34 — NLB Host Configuration

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Applies To: Windows Server 2008 R2

Hosts in a Network Load Balancing (NLB) cluster are configured to load balance network traffic. Host configuration is set by using NLB Manager, and if it is not configured properly, the NLB cluster may not function correctly.

 

Event Details

Product: Windows Operating System
ID: 34
Source: Microsoft-Windows-NLB
Version: 6.1
Symbolic Name: MSG_ERROR_REGISTRY
Message: NLB cluster [%2]: NLB failed to query parameters from the registry key HKLM\SYSTEM\CurrentControlSet\Services\WLBS\Parameters\Interface\%3. This might be due to an improper configuration. Please use Network Load Balancing Manager to configure NLB. Once the configuration is fixed, you should run the PowerShell cmdlet 'Set-NlbClusterNode -Reload' followed by 'Start-NlbClusterNode'.

Resolve

Confirm NLB configuration settings

If Network Load Balancing (NLB) is unable to process its configuration settings, you should confirm that the settings are correctly configured, and then, if changes are made, restart the NLB cluster.

When you are using NLB Manager, you must be a member of the Administrators group on the host that you are configuring, or you must have been delegated the appropriate authority. If you are configuring a cluster or host by running NLB Manager from a computer that is not part of the cluster, you do not have to be a member of the Administrators group on that computer.

Confirm the NLB configuration

To confirm the NLB configuration:

  1. Click Start, click Administrative Tools, and then click Network Load Balancing Manager. You can also open NLB Manager by typing Nlbmgr at a command prompt.
  2. If NLB Manager does not already list the cluster, connect to the cluster.
  3. Right-click the cluster, and then click Cluster Properties.
  4. As required, reconfigure the properties.

When you are using nlb.exe, you must be a member of the Administrators group on the host that you are configuring, or you must have been delegated the appropriate authority. If you are configuring a cluster or host by running nlb.exe from a computer that is not part of the cluster, you do not have to be a member of the Administrators group on that computer.

Restart the NLB cluster

To restart the NLB cluster:

  1. Open an elevated Command Prompt window. Click Start, point to All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator.
  2. Type nlb.exe reload, which reloads the NLB driver's current parameters from the registry.
  3. Type nlb.exe start, which starts cluster operations on the specified hosts.

Verify

When you are using nlb.exe, you must be a member of the Administrators group on the host that you are configuring, or you must have been delegated the appropriate authority. If you are configuring a cluster or host by running nlb.exe from a computer that is not part of the cluster, you do not have to be a member of the Administrators group on that computer.

To verify that all Network Load Balancing (NLB) hosts are in the converged state:

  1. Open an elevated Command Prompt window. Click Start, point to All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator.
  2. Type nlb.exe query, which displays the current cluster state and the list of host priorities for the current hosts of the cluster.
  3. Confirm that all hosts display converged as their current state.

NLB Host Configuration

NLB Cluster