Microsoft KB Archive/194787

= XFOR: IIS 4.0 SMTP Does Not Retry Delivery on HELO/EHLO Failures =

Article ID: 194787

Article Last Modified on 6/23/2005

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APPLIES TO


 * Microsoft Windows NT Server 4.0, Terminal Server Edition
 * Microsoft Internet Information Server 4.0

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This article was previously published under Q194787



We strongly recommend that all users upgrade to Microsoft Internet Information Services (IIS) version 6.0 running on Microsoft Windows Server 2003. IIS 6.0 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



SYMPTOMS
The SMTP service included with Internet Information Server 4.0 rejects messages when the HELO or EHLO command times out. When the SMTP service tries to deliver a message and times out while waiting for the response to the HELO or EHLO command, an NDR is generated and no further retries are attempted.



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 How to Obtain the Latest Windows NT 4.0 Service Pack



STATUS
Microsoft has confirmed this to be a problem in Microsoft Internet Information Server (IIS) 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.

Keywords: kbbug kbfix kbqfe KB194787

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