Microsoft KB Archive/182640

= Application Exception in Snaservr.exe in Function SNPUPUTI =

Article ID: 182640

Article Last Modified on 10/22/2003

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APPLIES TO


 * Microsoft SNA Server 4.0

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This article was previously published under Q182640



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= ) When: @ 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


 * > Stack Back Trace <*

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])

In addition, SNA Server logs an Event 624 in the Windows NT Application Event log similar to the following:

  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.

NOTE: This can only occur when SNA Server is configured to use PU PassThrough connections and one of these connections is configured to use Format 0 XIDs in the connection properties under the System Identification tab.



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. 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

Keywords: kbbug kbfix KB182640

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