DOCUMENT:Q275896 13-JUN-2001 [sna] TITLE :SNA Server Rejects TN3270 Client Data with Sense Code 200D PRODUCT :Microsoft SNA Server PROD/VER::3.0 (all SP),4.0,4.0 SP1,4.0 SP2,4.0 SP3 OPER/SYS: KEYWORDS:kbSNA400sp4fix kbSNA400PreSP4fix ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft SNA Server, versions 3.0 SP1, 3.0 SP2, 3.0 SP3, 3.0 SP4, 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3 ------------------------------------------------------------------------------- SYMPTOMS ======== TN3270(E) clients may intermittently lose their session to the host application. This problem occurs when the SNA Server TN3270 client is used to communicate with an SAS Statistical Analysis application. When the failure occurs, the emulator may display a message that indicates that a "BRACKET ERROR" was encountered; the actual format of the message may vary depending on the TN3270(E) emulator that is used. The SNA application LUA API traces that are gathered during an occurrence of the failure indicate the following return codes on the failed session: prim_rc=0x1400 (LUA_UNSUCCESSFUL) sec_rc=0x00000320 (LUA_BRACKET) In addition, the Microsoft Windows NT application event log may show the following events at the time that the failure occurs: EventID : 603 Source : TN3270 Server Description : TN3270(E) session with client at xxxx.xxxx.xxxx.xxxx (port xxxx)using LU ABCD terminated abnormally because: TN3270E Service Error 505 SNA API verb WRITE failed. Failure described as: RUI Write verb has completed with primary rc of Unsuccessful and secondary rc of Bracket Protocol Error. Explanation : A TN3270(E) client session was terminated abnormally EventID : 309 Source : TN3270 Server Description : WRITE failed with LUA_UNSUCESSFUL / LUA_BRACKET for xxxx.xxxx.xxxx.xxxx(port xxxx) Explanation : An SNA API call failed CAUSE ===== When this problem occurs, SNA Server receives data from the host with the CD CD (Change Direction) and DR1 (Definite Response) bits set, which it passes through TN3270 server to the client. However, the user of the TN3270 client is typing ahead and as a result the client then sends some data to the TN3270 server without first sending an ACK for the previous data frame from the host that had the DR1 bit set. This causes SNA Server to reject this new data frame with a sense code of 200D. RESOLUTION ========== To resolve this problem, obtain the latest service pack for SNA Server 4.0. For additional information, please see the following article in the Microsoft Knowledge Base: Q215838 How to Obtain the Latest SNA Server Version 4.0 Service Pack WORKAROUND ========== Microsoft recommends that customers use an emulator that adheres to the IBM TN3270 protocol specification. STATUS ====== Microsoft has confirmed this to be a problem in Microsoft SNA Server version 4.0, SP1, SP2 and SP3. This problem was first corrected in SNA Server 4.0 Service Pack 4. Additional query words: ====================================================================== Keywords : kbSNA400sp4fix kbSNA400PreSP4fix Technology : kbAudDeveloper kbSNAServSearch kbSNAServ400 kbSNAServ300SP3 kbSNAServ300SP1 kbSNAServ400SP1 kbSNAServ400SP2 kbSNAServ400SP3 kbSNAServ300SP2 kbSNAServ300SP4 Version : :3.0 (all SP),4.0,4.0 SP1,4.0 SP2,4.0 SP3 Issue type : kbbug Solution Type : kbfix ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2001.