Article ID: 294888 - View products that this article applies to.
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If a client instantiates an object from a SingleUse class in an ActiveX EXE server, and another client tries to instantiate the same SingleUse class while the first instance is processing messages (for example, while the first instance is running some code), the second client is blocked. Thus, the second instance of the ActiveX EXE is not started until the first instance has finished processing.
This blocking occurs only in environments that are running Windows 2000 and Windows 2000 Service Pack 1 (SP1). Blocking does not occur on Windows NT 4.0 (in any of its service packs).
To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/260910/EN-US/ )How to Obtain the Latest Windows 2000 Service Pack
Another resolution to this issue is found in the following Microsoft Knowledge Base article:
(https://support.microsoft.com/kb/313582/EN-US/ )INFO: Availability of Windows 2000 Post-Service Pack 2 COM+ Hotfix Rollup Package 18.1
Microsoft has confirmed that this is a problem in Microsoft Windows 2000. This problem was first corrected in Windows 2000 Service Pack 2.
Steps to Reproduce Behavior
Create the Server
Create the Client
Reproduce the Blocking Behavior
Article ID: 294888 - Last Review: February 28, 2014 - Revision: 2.0