The Network Load Balancing (NLB) driver on the host tracks connections to maintain client/network affinity configured on the NLB cluster. If the driver is not functioning properly, NLB may not be able to track TCP connections or may experience load distribution errors.
A load distribution error was detected during convergence of the Network Load Balancing (NLB) cluster. This may result in client traffic not being handled, general cluster traffic errors, or connections being reset. Convergence is a process by which hosts exchange messages to determine a new, consistent state of the cluster and to elect the default host. During convergence, a new load distribution is determined for hosts that share the handling of network traffic for specific Transmission Control Protocol (TCP) or User Datagram Protocol (UDP) ports. To resolve the load distribution error, you should restart the NLB cluster.
To restart the NLB cluster:
Open an elevated Command Prompt window. Click Start, point to All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator.
Type nlb.exe reload,which reloads the NLB driver's current parameters from the registry.
Type nlb.exe start, which starts cluster operations on the specified hosts.