MAD NSPI port is below 5000

[This topic is intended to address a specific issue called out by the Exchange Server Analyzer Tool. You should apply it only to systems that have had the Exchange Server Analyzer Tool run against them and are experiencing that specific issue. The Exchange Server Analyzer Tool, available as a free download, remotely collects configuration data from each server in the topology and automatically analyzes the data. The resulting report details important configuration issues, potential problems, and nondefault product settings. By following these recommendations, you can achieve better performance, scalability, reliability, and uptime. For more information about the tool or to download the latest versions, see "Microsoft Exchange Analyzers" at]  

Topic Last Modified: 2005-11-18

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

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

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

If you must set TCP/IP NSPI 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 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 NSPI 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 NSPI 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 limits, see the Knowledge Base article 194952, "XADM: Statically Mapped Port Limitations for Exchange Server" (