Topic Last Modified: 2005-11-18

The Microsoft® Exchange Server Analyzer Tool reads the following registry entry to determine the TCP/IP Port setting for the Microsoft Exchange System Attendant service:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeSA\Parameters\TCP/IP Port

If the Exchange Server Analyzer finds that the value for TCP/IP Port is set to a value below 5000 (decimal), a warning is displayed.

In the case where you must set TCP/IP Port to a static value, it is recommended that you set it to a value that is just over 5000. Assigning static port numbers under 5000 may cause a port conflict with another process and lead to failure of the Microsoft Exchange System Attendant service process.

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 set the TCP/IP port registry key

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

  2. Navigate to: HKLM\System\CurrentControlSet\Services\MSExchangeSA\Parameters

  3. Double-click the TCP/IP Port key, and set the Value data field to an integer just above 5000 (decimal).

  4. Close the registry editor.

  5. Restart the Microsoft Exchange System Attendant service for this change 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 port settings, see the Knowledge Base article 194952, "XADM: Statically Mapped Port Limitations for Exchange Server" (