Microsoft KB Archive/139978

= TN3270 Server Can Incorrectly Terminate a Session =

Article ID: 139978

Article Last Modified on 6/13/2001

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APPLIES TO


 * Microsoft SNA Server 3.0

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This article was previously published under Q139978





SYMPTOMS
There are two possible symptoms:
 * The TN3270 Server logs an error 309 and terminates the session.

-or-
 * The TN3270 Server encounters an application exception.



CAUSE
Occasionally, the TN3270 Server can process an RUI_READ completion before the verb has actually completed.

The RUI event completion code in the TN3270 Server leaves open timing windows where either of these two events might happen:
 * If an RUI_READ and RUI_WRITE are outstanding and the RUI_READ completes, the TN3270 Server might act as if the RUI_WRITE has completed.

-or-
 * If an RUI_READ and RUI_WRITE are outstanding and the RUI_WRITE completes, the TN3270 Server might act as if the RUI_READ has completed.

In either case, the TN3270 Server can examine the RUI verb control block at the same time the RUI library is filling in the verb control block.



RESOLUTION
Microsoft has updated the file to correct this problem.

EXE\WIN32\TN3SERVR.EXE



STATUS
Microsoft has confirmed this to be a problem in SNA Server for Windows NT. This problem was corrected in the latest SNA Server for Windows NT, 2.11 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: prodsna

Keywords: KB139978

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