This problem may occur if a Named Service Provider Interface (NSPI) and an RFR client access DSPROXY at the same time, shortly after a domain controller that Exchange 2000 uses shuts down. The DSProxy may cause an unhandled exception that can silently stop the system attendant (Mad.exe).
To resolve this problem, obtain the latest service pack for Microsoft Exchange 2000 Server. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
301378 XGEN: How to Obtain the Latest Exchange 2000 Server Service Pack
The English version of this fix has the following file attributes or later:
NOTE: Because of file dependencies, this update requires Microsoft Exchange 2000 Server Service Pack 2.
Microsoft has confirmed that this is a problem in Microsoft Exchange 2000 Server. This problem was first corrected in Microsoft Exchange 2000 Server Service Pack 3.