Article: Q214491
Product(s): Microsoft SNA Server
Version(s):
Operating System(s):
Keyword(s): kbsna300sp4fix kbsna400sp3fix
Last Modified: 08-MAY-2002
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The information in this article applies to:
- Microsoft SNA Server
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SYMPTOMS
========
The SNA Server service may terminate unexpectedly causing all connected users to
lose their existing host sessions. If Drwtsn32.exe is configured as the default
debugger on the system, a Drwtsn32.log file similar to the following will be
generated when this problem occurs:
Application exception occurred:
App: exe\snaservr.dbg (pid=<process id>)
When: <date> @ <time>
Exception number: c0000005 (access violation)
[...]
function: s1pwhses
0105ca83 0fbf542420 movsx edx,word ptr [esp+0x20]
ss:020de930=????
0105ca88 4a dec edx
0105ca89 bf02000000 mov edi,0x2
0105ca8e 83fa09 cmp edx,0x9
0105ca91 0f8754040000 jnbe s1pwhses+0x4ab (0105ceeb)
0105ca97 ff2495bccf0501
ds:0000001d=????????
jmp dword ptr [s1pwhses+0x57c
(0105cfbc)+edx*4]
0105ca9e 66837d1401 cmp word ptr [ebp+0x14],0x1
ss:03f0ea09=????
0105caa3 0f8542040000 jne s1pwhses+0x4ab (0105ceeb)
0105caa9 e928040000 jmp s1pwhses+0x496 (0105ced6)
0105caae 660fb65015 movzx dx,byte ptr [eax+0x15]
ds:02475074=??
FAULT ->0105cab3 6689551c mov [ebp+0x1c],dx
ss:03f0ea09=????
0105cab7 668b5022 mov dx,[eax+0x22]
ds:02475073=????
0105cabb 66895508 mov [ebp+0x8],dx
ss:03f0ea09=????
0105cabf 8a5024 mov dl,[eax+0x24]
ds:02475072=??
0105cac2 88550a mov [ebp+0xa],dl
ss:03f0ea08=??
0105cac5 668b400c mov ax,[eax+0xc]
ds:02475073=????
0105cac9 6689450c mov [ebp+0xc],ax
ss:03f0ea09=????
0105cacd 0fbf5104 movsx edx,word ptr [ecx+0x4]
ds:02e735fb=????
0105cad1 8a440a29 mov al,[edx+ecx+0x29]
ds:02e735fb=??
0105cad5 884520 mov [ebp+0x20],al
ss:03f0ea08=??
0105cad8 8b5109 mov edx,[ecx+0x9]
ds:02e735fa=????????
0105cadb 895530 mov [ebp+0x30],edx
ss:03f0ea08=????????
*----> Stack Back Trace <----*
FramePtr ReturnAd Param#1 Param#2 Param#3 Param#4 Function Name
03000002 00000000 00000000 00000000 00000000 00000000 snaservr!s1pwhses
(FPO: [EBP 0x00000000] [2,3,4])
03000012 00000000 00000000 00000000 00000000 00000000 snaservr!<nosymbols>
In addition, the SNA Server will log a message similar to the following in the
Windows NT Application Event Log:
Event ID: 624
Source: SNA Server
Description: Creating dump file <snaroot>\traces\snadump.log for
snaservr.exe.
For additional information about another SNA Server access violation caused by an
invalid emulator message, please see the following article in the Microsoft
Knowledge Base:
ARTICLE-ID: Q196921
TITLE : SNA Server Access Violation in Function S1PWLUSE()
CAUSE
=====
The access violation in the S1PWHSES() function is caused because the SNA Server
service attempts to process an incorrectly formatted message that it received
from a client across the native 3270 emulator interface (3270 Emulator Interface
Specification).
RESOLUTION
==========
SNA Server 4.0
--------------
To resolve this problem, obtain the latest service pack for SNA Server version
4.0. For additional information, please see the following article in the
Microsoft Knowledge Base:
Q215838 How to Obtain the Latest SNA Server Version 4.0 Service Pack
SNA Server 3.0
--------------
To resolve this problem, obtain the latest service pack for SNA Server version
3.0. For additional information, please see the following article in the
Microsoft Knowledge Base:
Q184307 How to Obtain the Latest SNA Server Version 3.0 Service Pack
STATUS
======
Microsoft has confirmed this to be a problem in Microsoft SNA Server versions
2.11, 2.11 SP1, 2.11 SP2, 3.0, 3.0 SP1, 3.0 SP2, 3.0 SP3, 4.0, 4.0 SP1, and 4.0
SP2. This problem was first corrected in SNA Server version 3.0 Service Pack 4
and SNA Server version 4.0 Service Pack 3.
MORE INFORMATION
================
After applying the update, the SNA Server service will discard the invalid
message that caused this access violation. In addition, the following message
will be logged in the Windows NT Application Event Log when one of these invalid
messages is detected:
Event ID: 98
Source: SNA Server
Description: A 3270 emulator sent an invalid message, which has been discarded
by SNA Server.
Client Workstation: <workstation name>
Client Domain: <domain name>
Client User: <user name>
For additional information about configuring Drwtsn32.exe as the default
debugger, please see the following article in the Microsoft Knowledge Base:
ARTICLE-ID: Q188296
TITLE : How to Disable Dr. Watson for Windows NT
Additional query words:
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Keywords : kbsna300sp4fix kbsna400sp3fix
Technology : kbAudDeveloper kbSNAServSearch
Version : :
Issue type : kbbug
Solution Type : kbfix
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