The dedicated IP addresses in Network Load Balancing (NLB) must be properly configured and be able to contact individual NLB cluster hosts. If the dedicated IP address is not configured correctly, you cannot use it to manage the host or for other non-cluster-related communication.
Ensure that the dedicated subnet mask is valid
If the dedicated subnet mask is not valid, the Network Load Balancing (NLB) cluster will converge and operate normally without the subnet mask. However, if the subnet mask is required for remote cluster management, make sure that it is specified in a valid format.
You should verify that the dedicated subnet mask is correctly specified.
To ensure that the dedicated subnet mask is correctly specified:
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 host that you want to configure, and then click Host Properties.
Click the Host Parameters tab, and, in Subnet mask, verify that the subnet mask is correctly specified. The mask should be entered in standard Internet dotted notation (for example, 255.255.255.0).