INETINFO Access Violation When Using SNA Server APPC

 Last reviewed: April 17, 1997
Article ID: Q157219
The information in this article applies to:
  • Microsoft SNA Server version 2.11 and 2.11 Service Pack 1
  • Microsoft Windows NT Server version 4.0
  • Microsoft Windows NT Internet Information Server version 2.0

SYMPTOMS

When you run Microsoft Internet Information Server (IIS) version 2.0 and use the HTTPODBC DLL to query a DB2 database using the StarQuest ODBC/DRDA driver included with the Microsoft SNA Server 2.11 Windows NT client software, the StarQuest ODBC driver uses an APPC session to communicate with a host or AS/400 DB2 database.

Whenever a SQL error is encountered by the ODBC driver, or even after a successful query response, the following access violation occurs: 

   App: exe\inetinfo.dbg <process id>
   When: <date and time>
   Exception number: c0000005 (access violation)
The Drwtsn32.log shows all the threads of the process; however, the log does not indicate the thread that encountered the "FAULT."

CAUSE

This problem occurs when Wappc32.dll is unloaded while one of the Snadmod.dll threads is executing the APPC routing procedure. The following stack trace of the failure is observed, indicating that the Snadmod.dll attempted to invoke a function that is no longer in memory:

> kb=24DFF1c, 24dff14, 24dff54 

FramePtr  RetAddr   Param1   Param2   Param3   Function Name
024dff1c 01ffaf06 101541a8 025b0004 00000001 0x024dff54 024dff50 01fee05a 101541a8 00000001 00000000 SNADMOD!sepdq2_int+0x106 024dff78 01fee32e 024dffa8 024dffa2 024dffa6 SNADMOD!sbpdin_int+0x21a 024dffb8 77f04f4a 00000000 02028172 00000000 SNADMOD!sepdramp+0xde 024dffec 00000000 01fee250 00000000 00000000 KERNEL32!BaseThreadStart+0x51

SNADMOD!_sepdq2_int@8+0x100: 

0x01ffaf00  51               push         ecx
0x01ffaf01  57               push         edi
0x01ffaf02  ff542420         call         dword ptr [esp+20]

RESOLUTION

A hot fix to SNA Server 2.11 and 2.11 Service Pack 1 is available to correct this problem.

STATUS

Microsoft has confirmed this to be a problem in SNA Server version 2.11 and 2.11 Service Pack 1. This problem was corrected in the latest Microsoft SNA Server 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 internet
Keywords : kbbug2.11 kbfix2.11.sp2 kbinterop kbprg snaappc
Version : 2.0 2.11 4.0
Platform : WINDOWS

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Last reviewed: April 17, 1997
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