INETINFO Access Violation When Using SNA Server APPC

ID: Q157219

The information in this article applies to:

Microsoft SNA Server, versions 2.11, 2.11 SP1
Microsoft Windows NT Server version 4.0
Microsoft Internet Information Server version 2.0
on the following platforms: NT

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 : kbinterop kbprg snaappc kbbug2.11 kbfix2.11.sp2
Version : WINDOWS:2.11,2.11 SP1; winnt:2.0,4.0
Platform : WINDOWS winnt
Issue type :