DOCUMENT:Q167682 13-JUN-2001 [sna] TITLE :Application Exceptions When Opening a SNA Server 2.11 COM.CFG PRODUCT :Microsoft SNA Server PROD/VER:WINDOWS:3.0,3.0 SP1 OPER/SYS: KEYWORDS:kbnetwork ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft SNA Server, versions 3.0, 3.0 SP1 ------------------------------------------------------------------------------- SYMPTOMS ======== An SNA Server 3.0 system may generate an application exception in an SNA Server module when you try to open an SNA Server 2.11 configuration file. This only occurs if the SNA Server 2.11 configuration contains duplicate LU numbers on a particular connection for a 3270 LU and a dependent LU 6.2 LU. This problem has been observed to cause application exceptions in the SnaBase service and in SNA Server Manager (Snaexp.exe). CAUSE ===== When SNA Server opens a configuration file (Com.cfg), it does two checks on 3270 LUs. The first check ensures that the LU number is unique among all 3270 LUs on a connection. The second check is used to look for LU number conflicts between 3270 LUs and dependent APPC LUs configured on a server. If either of these fail, the LU record is destroyed and an error variable set. The application exception occurs because the second check is being performed without regard to the error code being returned by the first check. This results in a destroyed LU record being passed to the test routine, causing the application exception. RESOLUTION ========== SNA Server has been updated to prevent it from performing the second check on 3270 LUs if the first check returns an error code. STATUS ====== Microsoft has confirmed this to be a problem in SNA Server versions 3.0 and 3.0 SP1. This problem was corrected in the latest SNA Server version 3.0 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 MORE INFORMATION ================ When this problem occurs, a Drwtsn32.log containing information similar to the following will be generated in the Windows NT directory: Application exception occurred: App: exe\snabase.DBG (pid=) When: @