DOCUMENT:Q140833 13-JUN-2001 [sna] TITLE :APPC Allocation Error Running Multithreaded Random & Bounce TP PRODUCT :Microsoft SNA Server PROD/VER:WINDOWS:2.11 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft SNA Server, version 2.11, on platform(s): - the operating system: Microsoft Windows NT ------------------------------------------------------------------------------- SYMPTOMS ======== When you run 4 to 5 copies of the Random & Bounce transaction program (TP) with 8 threads each, the APPC Allocate() verb fails with error: - Primary Return Code: 0003: AP_ALLOCATION_ERROR - Secondary Return Code: 084C0000: AP_TRANS_PGM_NOT_AVAIL_NO_RETRY The APPC return codes are logged after about 500,000 APPC verbs are executed. This problem was found using test applications and only under very heavy stress, when invoking a TP over 65000 times, therefore, this symptom rarely occurs. CAUSE ===== When the invoked TP issues the Receive_Allocate() verb and the Receive_Allocate() verb decrements the semaphore counter, the decrement of the semaphore counter (WaitForSingleObject())is done only when there are no pending Allocate()s waiting, instead of every time a Receive_Allocate() is processed. Each time a dload (Incoming Allocate ()) is processed by SnaBase a semaphore counter is increased (ReleaseSemaphore()) by one. After the semaphore counter has reached 65535, the ReleaseSemaphore() call fails with the following error: Error 289: ERROR_TOO_MANY_POSTS The SnaBase that processes the incoming Allocate() does not log any errors. However, the SnaServer who sent the Allocate() request, logs the following error in the Event Viewer: Event ID: 60 Failed to invoke APPC TP (value), sense data = 084C0000 EXPLANATION: An attempt to invoke the APPC TP shown has failed. The most common cause of this error (084c0000) is due to configuration problems where the invokable TP is not registered properly on an SNA Server in the domain. RESOLUTION ========== The semaphore counter is now decremented every time a Receive_Allocate() is processed. Also, the SnaBase that processes the incoming Allocate(), logs a new error: Error 703 subcode 1015 - ReleaseSemaphore() failed. There following six subcodes describe other possible allocate errors: 1010 - The server who sent the dload message was not found in the local service table. 1011 - The TP to be invoked was not found in the service table. 1012 - DMOD failed to create a new service table entry for the Non-Queued TP. 1013 - DMOD failed to create a new service table entry for the Queued TP. 1014 - OpenSemaphore() failed. 1016 - DMOD failed to start the TP (NT service or application). Microsoft has an update for the following Windows 95 client files only: \SYSTEM\DMODAPPC.DLL \SYSTEM\SNADMOD.DLL 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 2.11 ====================================================================== Keywords : Technology : kbAudDeveloper kbSNAServSearch Version : WINDOWS:2.11 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.