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Event ID 103 — NLB Host Configuration

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Applies To: Windows Server 2008

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: 103
Source: Microsoft-Windows-NLB
Version: 6.0
Symbolic Name: MSG_WARN_IPV6_NSI_CALLBACK_OPEN_FAILED
Message: NLB cluster [%2]: The NLB driver failed to register for notifications with the IPv6 NSI provider. NLB will continue to operate but may not handle auto-configured IPv6 addresses correctly. Please make sure that IPv6 is installed and working on this machine.

Resolve

Check that the correct IPv4/IPv6 version is installed on the network adapter

The correct IP stack version (IPv4 or IPv6) must be installed on the network adapter to which Network Load Balancing (NLB) is bound. The virtual IP address must be in a valid IPv4 or IPv6 format.

Membership in the local Administrators group, or equivalent, is the minimum required to complete these procedures.

Check that the correct IP stack version is installed on the network adapter

To check that the correct IP stack version (IPv4/IPv6) is installed on the network adapter:

  1. Click Start, click Network, and then click Network and Sharing Center.
  2. Under Tasks, click Manage network connections.
  3. Right-click the network adapter, and click Properties.
  4. On the Networking tab, verify that the correct IP stack is installed and that it is in a valid format. IPv4 addresses use the standard Internet dotted notation (for example, w.x.y.z). IPv6 addresses use 16-byte addresses, typically expressed in colon-hexadecimal notation. Colon-hexadecimal notation uses eight 4-digit hexadecimal numbers, with colons separating the 16-bit blocks (the 4-digit numbers). To manage addresses more easily, IPv6 suppresses leading zeros and compresses a single contiguous all-zero 16-bit block, represent the contiguous block with two colons (::). This is known as double-colon compression. An example of an IPv6 address with leading zeros suppressed is: FEC0:0:0:0:2AA:FF:FE3F:2A1C.

Disable and re-enable all network adapters

To disable and re-enable all network adapters:

  1. Click Start, click Network, and then click Network and Sharing Center.
  2. Under Tasks, click Manage network connections.
  3. Right-click the network adapter you want to disable, and click Disable. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
  4. Right-click the network adapter you want to enable, and click Enable. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.

 

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