SNA Server 3270 Emulator Session Drops With Event ID 21

 Last reviewed: February 1, 1996
Article ID: Q138862
The information in this article applies to:
  • Microsoft SNA Server for Windows NT, versions 2.0, 2.1, and 2.11

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 <value> (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

KBCategory: kbnetwork kbbug2.11
KBSubcategory: ntnetserv
Additional reference words: prodsna 2.00 2.10 2.11 win3270

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Last reviewed: February 1, 1996
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