IIS Registry Setting ReplyWithHTTP1.1 May Cause Problems

This article was previously published under Q193419
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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:For more information about IIS 7.0, visit the following Microsoft Web site:
If you set the following registry setting:
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W3SVC\Parameters   \ReplyWithHTTP1.1 REG_DWORD to 0 (zero)				

Internet Information Server (IIS) 4.0 will still use HTTP 1.1 features(such as chunked transfer encoding). This may cause problems on the clientsuch as TCP connections remaining open that the client assumes will beclosed, and the client displaying the chunk lengths as part of the HTML(because it is not expecting chunked content from a 1.0 server).
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.
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Article ID: 193419 - Last Review: 10/26/2013 13:39:00 - Revision: 6.0

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