Microsoft KB Archive/138858

= TN3270 User Session Is Lost Unexpectedly =

Article ID: 138858

Article Last Modified on 10/23/2003

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APPLIES TO


 * Microsoft SNA Server 3.0, when used with:
 * Microsoft Windows NT 4.0

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This article was previously published under Q138858





SYMPTOMS
When you use a TN3270 client program through the SNA Server 2.11 TN3270 Server service:
 * A TN3270 user session may be lost unexpectedly.
 * A TN3270 file transfer upload request may appear to be hung, though the TN3270 display session may have been reset to the initial host signon screen.
 * A TN3270 client emulator may fail to get a session through the TN3270 server.



CAUSE
The TN3270 server incorrectly requests definite response during a chain, even though exception response was requested by the TN3270 client application. The TN3270 server then receives the following error from the SNA Server LUA API interface:

prim_rc=0x1400 (LUA_UNSUCCESSFUL)

sec_rc=0x00000740 (LUA_DEFINITE_RSP_NOT_ALLOWED)

This causes the session to be reset.



RESOLUTION
To correct this problem, install the fix mentioned below. When exception response protocol is being used, the TN3270 server now properly sets the Definite Response indicator only when the End Chain (EC) is set.



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: 2.11 prodsna hang freeze

Keywords: kbbug kbfix KB138858

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