DOCUMENT:Q245487 13-JUN-2001 [sna] TITLE :APPC Program Never Retries New Local LU From Pool PRODUCT :Microsoft SNA Server PROD/VER::4.0,4.0 SP1,4.0 SP2,4.0 SP3 OPER/SYS: KEYWORDS:kbDSupport kbsna 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 ======== If an APPC application supplies a blank Local APPC LU alias to TP_STARTED and calls [MC_]ALLOCATE multiple times using rtn_ctl = AP_WHEN_SESSION_FREE (where all sessions on a Local APPC LU become in use), [MC_]ALLOCATE requests may start to fail even though other Local APPC LUs from the default pool are available. CAUSE ===== If an APPC application calls TP_STARTED once and receives a default Local APPC LU, all subsequent conversations that use that tp_id will use the same Local APPC LU alias. The APPC DLL (WAPPC32.dll) was not written to try a different default Local APPC LU in this case. 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 ========== An APPC application may work around this problem by calling TP_STARTED before every [MC_]ALLOCATE request (and by calling TP_ENDED after each conversation is not allocated). 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 ================ This specific problem won't occur with a CPIC application since CPIC doesn't support the equivalent of the APPC "AP_WHEN_SESSION_FREE" return control setting. Additional query words: ====================================================================== Keywords : kbDSupport kbsna kbSNA400sp4fix kbSNA400PreSP4fix Technology : kbAudDeveloper kbSNAServSearch kbSNAServ400 kbSNAServ400SP1 kbSNAServ400SP2 kbSNAServ400SP3 Version : :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.