Topic Last Modified: 2005-11-18

The Microsoft® Exchange Server Analyzer Tool queries the Win32_NetworkAdapter Microsoft Windows® Management Instrumentation (WMI) class to determine the value of the NetConnectionID key. If the value for the NetConnectionID key contains the string Internal, or HEART, it indicates that the interface is the cluster private (heartbeat) network.

The Exchange Server Analyzer also queries the Win32_NetworkAdapterConfiguration WMI class to determine whether a value is set for the DNSServerSearchOrder key. If a value is set, it indicates that a Domain Name System (DNS) search address has been configured for this network interface.

If the Exchange Server Analyzer finds a value set for the DNSServerSearchOrder key on the network interface used for the cluster heartbeat network, a warning is displayed.

Because private cluster networks are used for internal cluster communications, it is not necessary to configure any DNS servers. To eliminate possible communication issues, it is recommended that you remove all unnecessary network traffic from the network adapter that is used as the cluster private network adapter.

To correct this warning

  1. Open the Network Connections window. Either right-click My Network Places, and then click Properties, or if My Network Places is not displayed on the desktop, click Start, click Programs, click Accessories, click Communications, and then click Network Connections.

  2. In the Network Connections window, right-click the network adapter being used for the private network, and then click Properties.

  3. Select Internet Protocol (TCP/IP), and then click Properties.

  4. Click Advanced.

  5. On the DNS tab, select a DNS server address, and then click Remove. Repeat this step for each DNS server address listed.

  6. Clear the Register this connection's addresses in DNS and Use this connection's DNS suffix in DNS registration check boxes.

  7. Click OK three times to save the changes.

  8. Repeat steps 1 through 7 for each node in the cluster.

For more information about the recommended settings for the private network in a Windows server cluster, see the Microsoft Knowledge Base article 258750, "Recommended Private 'Heartbeat' Configuration on a Cluster Server" (