Event ID 110 — 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: 110
Source: Microsoft-Windows-NLB
Version: 6.1
Symbolic Name: MSG_WARN_VIRTUAL_MISMATCH
Message: NLB cluster [%2]: NLB detected an unequal number of virtual IP (VIP) addresses and network masks. For all VIP's listed for use, an equal number of network masks must be specified. The NLB cluster will continue to operate but the VIP with no corresponding network mask will be ignored. To use this VIP, make sure that the number of addresses and network masks are the same.

Resolve

Ensure a consistent number of virtual IP addresses and subnet masks

On all Network Load Balancing (NLB) cluster hosts, the virtual IP addresses must have an equal number of subnet masks specified.

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.

To ensure that the number of virtual IP addresses is the same as the number of subnet masks:

  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 host that you want to configure, and then click Host Properties.
  4. Click the Host Parameters tab.
  5. In IP address and Subnet mask, verify that for each virtual IP address there is a corresponding subnet mask. If necessary, enter a valid virtual IP address or subnet mask.

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