DDE Client Experiences Intermittent DDE Disconnects

ID: Q165245

The information in this article applies to:

Microsoft Windows NT Workstation version 4.0
Microsoft Windows NT Server version 4.0

SYMPTOMS

A DDE client application may experience intermittent DDE disconnect problems.

CAUSE

XTYP_DISCONNECT message is sent by DDEML to the client application under the following scenario:

Server is generating frequent calls to DdePostAdvise() on a single data item.

Client is making frequent requests to advise/unadvise on the same item.

The client transactions must be of type


   XTYP_ADVSTART | XTYPF_ADVREQ and XTYP_ADVSTOP.
   (Hot links of type XTYP_ADVSTART do not exhibit this problem.)

Under these circumstances, when a data packet is generated by the server after DDEML is notified by the client of a request to unadvise but prior to the generation of the ACK for this unadvise, DDEML sends a message of type XTYP_DISCONNECT to the client.

STATUS

Microsoft has confirmed this to be a problem in Microsoft Windows NT version 4.0. This problem was corrected in the latest Microsoft Windows NT 4.0 U.S. Service Pack. For information on obtaining the service pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K

Additional query words: 4.00 prodnt

Keywords : kbnetwork kbbug4.00 kbfix4.00 nt32ap NTSrvWkst
Version : 4.0
Platform : winnt
Issue type : kbbug