Microsoft KB Archive/138862

= SNA Server 3270 Emulator Session Drops With Event ID 21 =

Article ID: 138862

Article Last Modified on 12/5/2003

-

APPLIES TO


 * Microsoft SNA Server 2.0, when used with:
 * Microsoft Windows NT 4.0
 * Microsoft SNA Server 2.1, when used with:
 * Microsoft Windows NT 4.0
 * Microsoft SNA Server 3.0, when used with:
 * Microsoft Windows NT 4.0

-



This article was previously published under Q138862





SYMPTOMS
When you use the SNA Server 3270 emulator connected to a host application, the 3270 emulator session may reset and Event 21 appears in the application event log in Event Viewer. This is explained as:

(1123) Negative Response Sent on Connection (SENSE=081B0000).

NOTE: The 081B0000 sense code explains: "Receiver in transmit mode: A race condition exists: a normal-fow request was received while the half-duplex contention state was not receive, or while resources (such as buffers) necessary for handling normal-flow data were unavailable."



CAUSE
When the 3270 emulator receives an SNA Status Control (BID) request from the host after you start typing, the 3270 applet accepts the BID. However, the 3270 emulator may later reject the data from the host in the following RU with the Begin Bracket Indicator (BBI) flag set. This causes the host to drop the session.



RESOLUTION
To correct this problem, apply the fix mentioned below.



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 2.00 2.10 2.11 win3270

Keywords: kbbug kbfix KB138862

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.