Application Exception in Snaservr.exe in Function SNPUPUTI

• Microsoft SNA Server, version 4.0

SYMPTOMS

An SNA Server 4.0 system may experience an application exception in the Snaservr.exe file in function SNPUPUTI when a PU PassThrough connection is configured to use Format 0 XIDs.

When this occurs, a Drwtsn32.log file is generated in the Windows NT directory. The Drwtsn32.log file will contain an entry similar to the following:

 Application exception occurred:
    App: snaservr.exe (pid=<process id>)
    When: <date> @ <time>
    Exception number: c0000005 (access violation)

 function: snpuputi
    0100a65a 8d4e06       lea     ecx,[esi+0x6] ds:014aea06=????????
    0100a65d 2bd3         sub     edx,ebx
    0100a65f 0fbfdf       movsx   ebx,di
    0100a662 3bda         cmp     ebx,edx
    0100a664 7e27         jle     snpuputi+0x4d (0100a68d)
    0100a666 85f6         test    esi,esi
    0100a668 7427         jz      snpuputi+0x51 (0100a691)
    0100a66a 668b00       mov     ax,[eax] ds:01d0fff7=0000
    0100a66d 8b36         mov     esi,[esi] ds:00000000=????????
    0100a66f 662b01       sub     ax,[ecx]  ds:01d09d76=0013
fault ->0100a672 0fbf5604 movsx   edx,word ptr [esi+0x4] ds:014aea07=????
    0100a676 0fbf5e06     movsx   ebx,word ptr [esi+0x6] ds:014aea07=????
    0100a67a 8d7c07ff     lea     edi,[edi+eax-0x1] ds:031be9fe=????????
    0100a67e 8d4604       lea     eax,[esi+0x4] ds:014aea06=????????
    0100a681 8d4e06       lea     ecx,[esi+0x6] ds:014aea06=????????
    0100a684 2bda         sub     ebx,edx
    0100a686 0fbfd7       movsx   edx,di
    0100a689 3bd3         cmp     edx,ebx
    0100a68b 7fd9         jg      snpuputi+0x26 (0100a666)
    0100a68d 85f6         test    esi,esi
    0100a68f 750f         jnz     snpuputi+0x60 (0100a6a0)
    0100a691 55           push    ebp

FramePtr ReturnAd Param#1 Param#2 Param#3 Param#4 Function Name

 00dafeec 01041647 01d09d70 0000001a 00000901 01180013 snaservr!snpuputi
    (FPO: [EBP 0x01d09d70] [3,0,4])

   Creating dump file C:\SNA\traces\snadump.log for Snaservr.exe

   EXPLANATION
   A process (Snaservr.exe) ended abnormally due to a protection
   violation or similar condition and a dump file Snadump.log has been
   created that contains information about the state of the process at
   the time of the exception. Register information is contained in your
   Windows NT root directory in the file Drwtsn32.log.

CAUSE

The application exception is caused when SNA Server attempts to forward a Format 3 XID received on one PU PassThrough connection to its partner PU PassThrough connection that is configured to use Format 0 XIDs.

WORKAROUND

To work around this problem, configure all PU PassThrough connections to use Format 3 XIDs.

STATUS

Microsoft has confirmed this to be a problem in SNA Server version 4.0. A supported fix is now available, but has not been fully regression-tested and should be applied only to systems experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft recommends that you wait for the next Service Pack that contains this fix. Contact Microsoft Technical Support for more information.

Keywords          : prodsna snaserverservice kbbug4.00 snapassthru
Version           : WINDOWS:4.0
Platform          : WINDOWS
Issue type        : kbbug
Solution Type     : kbfix