Number of port rules exceeds the configured maximum

Summary

In a Network Load Balancing (NLB) cluster, port rules are configured to control how each port's cluster network traffic is handled. The NLB cluster may fail to converge unless each port rule has a unique host priority (a number between 1 and 32), the port rules are consistent on all cluster hosts, you are using the proper number of port rules, and the virtual IP address is specified in a valid IPv4 or IPv6 address format.

Resolutions

Ensure that all NLB hosts have identical port rules

When a Network Load Balancing (NLB) host in the cluster either contains a different number of port rules from another host, or its configured port rules conflict with the port rules of another host, the cluster will not converge until the problem is corrected. You should first ensure that all NLB hosts have identical port rules, and then, if there are port rules that are not identical and if there are not the same number of port rules on each NLB host, you should reconfigure the port rules to make them identical.

Ensure that all NLB hosts have identical port rules

To ensure that all NLB hosts have identical port rules:

• On each NLB host, 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.

• Click the Port Rules tab, and review the port rules to verify that they are identical with the rules on the other NLB hosts.

If there are port rules that are not identical and if there are not the same number of port rules on each NLB host, you should reconfigure the port rules to make them identical.

Configure port rules

To configure port rules:

• 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 Cluster Properties.

• Click the Port Rules tab.

• In the Defined port rules list, click a rule, and then click Edit. If you need to add a new port rule, click Add. As required, modify the cluster IP address that you want this rule to apply to, the port range, protocols and filtering mode parameters as required, and then click OK.