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.
Configure the cluster network MAC address
If the network media access control (MAC) address is not in the following form xx-xx-xx-xx-xx-xx, where x is a hexadecimal value, it needs to be reconfigured.
To configure the network MAC address by using NLB Manager:
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.
If NLB Manager does not already list the cluster, connect to the cluster.
Right-click the cluster, and then click ClusterProperties.
In Network address, type the network MAC address in a valid format (xx-xx-xx-xx-xx-xx, where x is a hexadecimal value).