MS-DOS-based communications program experiences intermittent transmission problems after you upgrade to Windows 2000 SP3

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You may experience symptoms that are similar to the following when you use a 16-bit MS-DOS-based communications program after you upgrade Microsoft Windows 2000 to Windows 2000 Service Pack 3 (SP3):
  • The communications program completes a dial-up connection to another computer, but the data transmission is unsuccessful.
  • If you retry the connection, the communications program completes the data transmission successfully.
  • If you replace the Windows 2000 SP3 NTVDM.exe file with an earlier version, the problem is resolved.
This problem occurs because the NTVDM.exe program that is included with Windows 2000 SP3 does not correctly initialize a particular variable before use. Therefore, an initial communications connection may be unsuccessful because a character may be truncated from the data transmission.

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


You must be running Microsoft Windows 2000 Service Pack 3 (SP3) or later to install this hotfix. For additional information about how to obtain the latest service pack for Windows 2000, click the following article number to view the article in the Microsoft Knowledge Base:
260910 How to obtain the latest Windows 2000 service pack

Restart requirement

You must restart your computer to apply the changes after you apply this hotfix. However, you do not have to restart your computer immediately after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this 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   --------------------------------------------------------------   18-Sep-2003  00:20   5.0.2195.6822    396,560   Ntvdm.exe   19-Sep-2003  23:19   5.0.2195.6820    240,912   Wow32.dll
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section of this article.
For additional information, click the following article numbers to view the articles in the Microsoft Knowledge Base:
816915 New file naming schema for Microsoft Windows software update packages
824684 Description of the standard terminology that is used to describe Microsoft software updates

Article ID: 827652 - Last Review: 10/26/2013 19:38:55 - Revision: 2.5

  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Professional Edition
  • Microsoft Windows 2000 Advanced Server
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