FTP Service May Cause Deadlock in FTP and Other IIS Services

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This article was previously published under Q191822

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:

http://www.microsoft.com/technet/security/prodtech/IIS.mspx (http://www.microsoft.com/technet/security/prodtech/IIS.mspx)

For more information about IIS 7.0, visit the following Microsoft Web site:

http://www.iis.net/default.aspx?tabid=1 (http://www.iis.net/default.aspx?tabid=1)

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SYMPTOMS

The FTP service in the Windows NT Option Pack may cause a deadlock in the Inetinfo process when timing out inactive users. This may cause other services, 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 are experiencing this problem only by debugging or by testing the hotfix described below.

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CAUSE

The lock is being held on a list when a completion routine for a timeout is being called. This results in a deadlock. In the hotfix, the lock is now released before calling the completion routine.

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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 the Microsoft Knowledge Base:

152734 (http://support.microsoft.com/kb/152734/EN-US/ ) How to Obtain the Latest Windows NT 4.0 Service Pack

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STATUS

Microsoft has confirmed this to be a problem in Internet Information Server 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.

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