DOCUMENT:Q182574 15-MAR-2000 [sna] TITLE :SNA Server Stops Forwarding FMH-5 Attach Messages PRODUCT :Microsoft SNA Server PROD/VER:WINDOWS:3.0,3.0 SP1,3.0 SP2,3.0 SP3,4.0 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft SNA Server, versions 3.0, 3.0 SP1, 3.0 SP2, 3.0 SP3, 4.0 ------------------------------------------------------------------------------- SYMPTOMS ======== SNA Server may unexpectedly stop forwarding FMH-5 Attach messages to a specific branch-based SNA Server client computer (where the invokable transaction program [TP] is registered or running). When this occurs, SNA Server reports an Event 60 (DLOAD timeout) in the server's application log. For example: Event ID: 60 Source: SNA Server Description: Failed to invoke APPC TP , sense data = 084C0000 084C0000 refers to AP_TRANS_PGM_NOT_AVAIL_NO_RETRY. On the client computer, the APPC or CPIC invokable TP may never be invoked, or if it is running, the TP's call to CMAPPC or RECEIVE_ALLOCATE will not complete. To recover from this problem, the SnaBase service on the Windows NT client computer must be stopped and restarted. CAUSE ===== This problem can occur when the SNA Server client's sponsor connection (LAN session) to the server-side SnaBase service is lost. This problem occurs when the client-end of the client end of the LAN connection fails first. If the SNA Server client's sponsor fails and reconnects to the SnaBase before SnaBase is notified of the LAN session failure, a timing window exists where client invokable TP's are deregistered even though the client has reconnected. This problem has also been observed if the client is connecting against two or more SNA Servers, where its client sponsor reconnects against another server after a sponsor connection failure. This problem has been observed when an SNA Server Windows NT client is connecting to an SNA Server over TCP/IP sockets, although it may occur with other LAN interfaces. WORKAROUND ========== To work around this problem, determine and correct the cause of the underlying LAN session failure between the SNA Server client and the server. STATUS ====== Microsoft has confirmed this to be a problem in SNA Server versions 3.0, 3.0 SP1, 3.0 SP2, 3.0 SP3, and 4.0. This problem was corrected in the latest SNA Server version 4.0 U.S. Service Pack. For information on obtaining this 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: ====================================================================== Keywords : Technology : kbAudDeveloper kbSNAServSearch kbSNAServ300 kbSNAServ400 kbSNAServ300SP3 kbSNAServ300SP1 kbSNAServ300SP2 Version : WINDOWS:3.0,3.0 SP1,3.0 SP2,3.0 SP3,4.0 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.