Topic Last Modified: 2005-11-18

The Microsoft® Exchange Server Analyzer Tool queries the Win32_NetworkAdapterConfiguration Microsoft Windows® Management Instrumentation (WMI) class to determine whether a value is set for the DNSServerSearchOrder. If the value for this key on an Exchange server is blank, a warning is displayed.

This warning indicates that one or more of the network adapters on this computer do not have DNS IP addresses associated with them. Therefore, when this computer tries to connect to another computer, it is broadcasting across the local network for IP addresses. Therefore, name resolution will be slow, which may slow Exchange.

It is recommended that an IP address of at least one valid DNS server be entered. If you have more than one adapter on the computer, verify that all adapters have at least one valid DNS server IP address.

To set the DNS IP address on a network adapter

  1. In Network Connections, right-click the appropriate Local Area Network adapter, and then click Properties.

  2. On the General tab, double-click Internet Protocol (TCP/IP).

  3. On the General tab of the Internet Protocol (TCP/IP) page, enter at least one IP address of a valid DNS server, and then click OK.

For more information about configuring DNS to work with Exchange, see the Microsoft Knowledge Base article 322856, "How to configure DNS for use with Exchange Server" (