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When the ODBC driver closes its connections, the Mtxoci.dll module of the Microsoft Distributed Transaction Coordinator (MSDTC) can leak threads. For example, you may find hundreds of the following threads in the Microsoft SQL Server process:
When the MSDTC XA Transaction Manager disconnects from the database while active transactions exist, an internal reference countering problem may cause the internal service threads inside the Mtxoci.dll module to remain in service.
How to obtain the hotfix
This issue is fixed in the Windows 2000 Server COM+ 1.0 Hotfix Package 28. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
828748 FIX: Availability of Windows 2000 Post-Service Pack 4 COM+ 1.0 Hotfix Rollup Package 28
Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the "Applies to" section of this article.