DOCUMENT:Q262473 08-DEC-2000 [sna] TITLE :LU 6.2 Data Compression Fails When Initiated by Host System PRODUCT :Microsoft SNA Server PROD/VER:WINDOWS:4.0,4.0 SP1,4.0 SP2,4.0 SP3 OPER/SYS: KEYWORDS:sna4 kbsna400sp1 kbsna400sp2 kbsna400sp3 kbSNA400sp4fix kbSNA400PreSP4fix ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft SNA Server, versions 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3 ------------------------------------------------------------------------------- SYMPTOMS ======== SNA Server does not use LU 6.2 data compression when the BIND is a host initiated, non-extended BIND. Compression is not used even though it has been configured on both the connection and on the APPC mode definition. CAUSE ===== When SNA Server negotiates LU 6.2 compression, it checks the level of compression that is configured on the mode entry and the level of compression that is configured on the connection. It obtains this information from a connection record in an internal connection table. This problem occurs because SNA Server is incorrectly reading the connection record, and therefore, it obtains the wrong value for compression support. Because of this, SNA Server does not accept the host systems request for data compression. 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 ========== This problem does not occur when SNA Server initiates the BIND with the host. In most scenarios, setting an Automatic Activation Limit on the APPC mode definition eliminates this problem by forcing SNA Server to initiate the BIND with the host. STATUS ====== Microsoft has confirmed this to be a problem in Microsoft SNA Server version 4.0, 4.0 SP1, 4.0 SP2, and 4.0 SP3. This problem was first corrected in SNA Server 4.0 Service Pack 4. MORE INFORMATION ================ For LU 6.2 data compression to work on SNA Server, it needs to be configured on both the connection and the APPC mode definition. This is also true for 3270/LUA LU data compression, which needs to be configured on both the connection and the LU. For additional information on how to configure SNA Server for compression when non-extended BINDs are used, click the article number below to view the article in the Microsoft Knowledge Base: Q266091 Configuring For Host Compression When Using Non-Extended BINDs Additional query words: ====================================================================== Keywords : sna4 kbsna400sp1 kbsna400sp2 kbsna400sp3 kbSNA400sp4fix kbSNA400PreSP4fix Technology : kbAudDeveloper kbSNAServSearch kbSNAServ400 kbSNAServ400SP1 kbSNAServ400SP2 kbSNAServ400SP3 Version : WINDOWS: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 2000.