Microsoft KB Archive/198573

= 16-bit Windows-Based Programs Support Up to 26 DDE Connections =

Article ID: 198573

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Windows NT Server 4.0 Enterprise Edition

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This article was previously published under Q198573



SYMPTOMS
A 16-bit Windows-based application, which uses many DDE connections, fails after a while when running on Windows NT. The application works correctly on Windows 3.1.



CAUSE
After more than 26 concurrent DDE connections have been created, an error 0x400f (a system API failed inside of the DDEML) is returned when closing the twenty-seventh connection. This problem is due to a timer, which is associated with a window, not being freed when the relevant window is destroyed.



RESOLUTION
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the individual software update. For information on obtaining the latest service pack, please go to:


 * http://www.microsoft.com/windows/servicepacks/ -or-


 * 152734 how to obtain the latest windows nt 4.0 service pack

For information on obtaining the individual software update, contact Microsoft Product Support Services. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://support.microsoft.com/directory/overview.asp



STATUS
Microsoft has confirmed this to be a problem in Windows NT version 4.0. This problem was first corrected in Windows NT version 4.0 Service Pack 5.

Additional query words: Exchange Dynamic Data 4.00 WOW DMLERR_SYS_ERROR

Keywords: kbhotfixserver kbqfe kbbug kbfix kbqfe KB198573

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