Microsoft KB Archive/829920

= Users cannot connect to your SMTP server when the number of concurrent connections reaches 2,000 =

Article ID: 829920

Article Last Modified on 2/21/2007

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APPLIES TO

 Microsoft Exchange 2000 Server Standard Edition, when used with:  Microsoft Windows 2000 Server

 Microsoft Windows 2000 Advanced Server 

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SYMPTOMS
When the number of concurrent inbound SMTP connections reaches 2,000, users may not be able to connect to your server, and they may receive the following error message:

Error on telnet port 25:

421-Microsoft ESMTP MAIL Service, Version: 5.0.2195.6713 ready at Service not available, closing transmission channel

Connection to host lost.



Hotfix information
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites
Windows 2000 Service Pack 4 (SP4).

Restart requirement
You must restart your computer after you apply this hotfix.

Hotfix replacement information
This hotfix does not replace any other hotfixes.

File information
The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.   Date         Time   Version            Size    File name --  13-Nov-2003  21:34  5.0.2195.6872     322,320  Aqueue.dll 13-Nov-2003 21:34  5.0.2195.6824      67,856  Mailmsg.dll 13-Nov-2003 21:34  5.0.2195.6872      38,672  Ntfsdrv.dll 13-Nov-2003 21:34  5.0.2195.6874     445,200  Smtpsvc.dll

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STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section of this article.

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MORE INFORMATION
For additional information about how hotfix packages are named, click the following article number to view the article in the Microsoft Knowledge Base:

816915 New File Naming Schema for Microsoft Windows Software Update Packages

For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the Standard Terminology That Is Used to Describe Microsoft Software Updates

Keywords: kbhotfixserver kbqfe kberrmsg kbbug kbfix kbqfe kbwin2000presp5fix KB829920

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