Valid Subscribers May No Longer Receive All Events When One Unregisters Its Subscription
View products that this article applies to.
SYMPTOMS
The Microsoft COM+ event system may generate the following event log notifications:
Event Type: Warning
Event Source: EventSystem
Event Category: Event Service
Event ID: 4106
Date: 3/14/2002
Time: 2:34:46 PM
User: N/A
Computer: N/A
Description: The COM+ Event System detected a corrupt IEventSubscription object. The COM+ Event System has removed object ID {...}.
The subscriber will no longer be notified when the event occurs.
CAUSE
When a publisher fires an event, the COM+ event system enumerates all subscribers to trigger the event on all subscribers. If a subscriber unregisters a transient subscription during this enumeration, the whole enumeration can fail, and the publishing fails altogether.
RESOLUTION
How to Obtain the Hotfix
This issue is fixed in the Microsoft Windows 2000 Post-Service Pack 4 (SP4) COM+ 1.0 Hotfix Package 27. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
 
822618 INFO: Availability of Windows 2000 Post-Service Pack 4 COM+ Hotfix Rollup Package 27
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section of this article.