Topic Last Modified: 2006-01-11

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

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeIS\ParametersSystem\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.

If you must set the TCP/IP Port setting to a static value, it is recommended that you set it to a value that is equal to or greater than 5000. If a value lower than 5000 is set, it may cause the Exchange server to stop listening on that port. The Exchange server will remain in this state until a service is restarted (the service to be restarted depends on the component of Exchange that has been hard coded).

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\MSExchangeIS\ParametersSystem

  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 Information Store 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 270836, "Exchange Server static port mappings" (