This article was previously published under Q191822
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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:
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.
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.
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
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.