FTP Service May Cause Deadlock in FTP and Other IIS Services

This article was previously published under Q191822
This article has been archived. It is offered "as is" and will no longer be updated.
We strongly recommend that all users upgrade to Microsoft Internet Information Services (IIS) version 7.0 running on Microsoft Windows Server 2008. IIS 7.0 significantly increases Web infrastructure security. For more information about IIS security-related topics, visit the following Microsoft Web site:For more information about IIS 7.0, visit the following Microsoft Web site:
Symptoms
The FTP service in the Windows NT Option Pack may cause a deadlock in theInetinfo process when timing out inactive users. This may cause otherservices, such as the World Wide Web (w3svc) service, to become non-responsive as well.

The symptoms are otherwise non-specific. You can determine whether you areexperiencing this problem only by debugging or by testing the hotfixdescribed below.
Cause
The lock is being held on a list when a completion routine for a timeoutis being called. This results in a deadlock. In the hotfix, the lock isnow released before calling the completion routine.

Resolution
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
152734 How to Obtain the Latest Windows NT 4.0 Service Pack

Status
Microsoft has confirmed this to be a problem in Internet InformationServer version 4.0. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.

sp hot fix qfe
Properties

Article ID: 191822 - Last Review: 10/26/2013 13:25:00 - Revision: 5.0

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