After statically mapping ports for the system attendant, directory NSPI proxy, and information store interfaces on a Microsoft Exchange 2000 Server cluster server behind a firewall, you also need to configure registry entries and install a hotfix for Dsproxy. If you do not do this, you receive the following error message when failing over on the Exchange nodes:

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The DSProxy component in Exchange 2000 that provides directory access to the domain controller or global catalog for non-Microsoft Outlook 2000 clients is not cluster-aware. It makes no check point to the registry in case of failover.

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Warning If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
If ports are statically mapped on a cluster server, you must manually adjust the following registry keys on both nodes, and install the hotfix referenced in this article.

Note that when the following keys do not exist, DSProxy uses the compiled-time defaults or pass-in parameters.

Warning If you are performing directory replication by using the Site Replication Service (SRS) between Exchange 2000 or Microsoft Exchange Server 2003 computers and Microsoft Exchange Server 5.5 computers, you should not configure static ports on an Exchange cluster. This is because static port mapping requires disabling the Request for Response (RFR) service. Disabling the Request for Response (RFR) service adversely affects SRS directory replication. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
Adjust the following registry key as indicated in the following table:

+------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Key                        | Data type              | Value                                                                                                | 
+------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NSPI Target Server         | REG_SZ or REG_MULTI_SZ | DC server name used for MAPI client proxy service.                                                   | 
+------------------------------------------------------------------------------------------------------------------------------------------------------------+
| RFR Target Server          | REG_SZ or REG_MULTI_SZ | DC server name used for MAPI client referral service.                                                | 
+------------------------------------------------------------------------------------------------------------------------------------------------------------+
| No RFR Service             | REG_DWORD              | Set to 1 to turn off referral service.                                                               | 
+------------------------------------------------------------------------------------------------------------------------------------------------------------+
| TCP/IP NSPI Port           | REG_DWORD              | TCP port number if other than system default.                                                        | 
+------------------------------------------------------------------------------------------------------------------------------------------------------------+
| IPX/SPX NSPI Port          | REG_DWORD              | IPX port number if other than system default.                                                        | 
+------------------------------------------------------------------------------------------------------------------------------------------------------------+
| AppleTalk NSPI Port        | REG_DWORD              | AT port number if other than system default.                                                         | 
+------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NSPI Max Worker Threads    | REG_DWORD              | Maximum worker threads use to contact the NSPI interface. Default is 10.                             | 
+------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NSPI Polling Times (msecs) | REG_DWORD              | Time the listener threads sleep when idle. Default value is 1 msec provided by the system attendant. | 
+------------------------------------------------------------------------------------------------------------------------------------------------------------+
				

Adjust the following registry key as indicated in the following table:

+--------------------------------------------------------------------+
| Key           | Data type | Value                                  | 
+--------------------------------------------------------------------+
| NSPI Proxy    | REG_DWORD | Logging Level: 0,1,3,5 (default is 0). | 
+--------------------------------------------------------------------+
| RFR Interface | REG_DWORD | Logging level: 0,1,3,5 (default is 0). | 
+--------------------------------------------------------------------+
				

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language. The English version of this fix should have the following file attributes or later:

Component: Dsproxy

File name	Version
Dsproxy.dll	6.0.4418.32

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Microsoft has confirmed that this is a problem in Microsoft Exchange 2000 Server.

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For additional information about mapping ports for the system attendant, directory NSPI proxy, and information interfaces on an Exchange 2000 server, click the following article number to view the article in the Microsoft Knowledge Base:

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