Topic Last Modified: 2007-01-15

The Microsoft® Exchange Server Analyzer Tool reads the following registry entry on global catalog servers to determine whether the TCP/IP Port registry key is set:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NTDS\Parameters\TCP/IP Port

If the Exchange Server Analyzer finds that the TCP/IP Port registry key has been created and is set, a non-default configuration message is displayed.

The TCP/IP Port registry key is required when a global catalog server needs to use a specific port for servicing MAPI clients. If you do not have such a requirement in your Exchange environment, you can remove this key.


This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore the registry if a problem occurs. For information about how to restore the registry, view the "Restore the Registry" Help topic in Regedit.exe or Regedt32.exe.

To delete the TCP/IP port on the global catalog server

  1. Open a registry editor, such as Regedit.exe or Regedt32.exe.

  2. Navigate to: HKLM\SYSTEM\CurrentControlSet\Services\NTDS\Parameters

  3. Right-click the TCP/IP Port key, and then click Delete.

  4. Close the registry editor.

  5. Restart the computer for this setting to take effect.

Before you edit the registry, and for information about how to edit the registry, see the Microsoft Knowledge Base article 256986, "Description of the Microsoft Windows Registry" (

For more information about configuring RPC over HTTP, see the following Knowledge Base articles: