Microsoft KB Archive/831896

= FIX: An Access Violation Occurs in the Supusrpd_wrk Function in the SNA Server Service When You Use Single Sign-On =

Article ID: 831896

Article Last Modified on 10/26/2005

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APPLIES TO


 * Microsoft Host Integration Server 2000 Standard Edition
 * Microsoft Host Integration Server 2000 Service Pack 1
 * Microsoft SNA Server 4.0
 * Microsoft SNA Server 4.0 Service Pack 1
 * Microsoft SNA Server 4.0 Service Pack 2
 * Microsoft SNA Server 4.0 Service Pack 3
 * Microsoft SNA Server 4.0 Service Pack 4

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SYMPTOMS
When the Microsoft SNA Server service (Snaservr.exe) processes an Advanced Program-to-Program Communication (APPC) single sign-on (SSO) request, you may experience the following symptoms:  The SNA Server service terminates unexpectedly. You receive an Access Violation error message in the supusrpd_wrk function. If the Drwtsn32.exe file is configured as the default Windows debugger, a Drwtsn32.log entry is also created.  The following event is logged in the application event log when the access violation occurs: Event ID: 624 Source: SNA Server Description: Creating dump file \snadump.log for Snaserver.exe 

The following is an example of a Drwtsn32.log entry that may be created (note the function names) when this problem occurs: Application exception occurred: App: exe\snaservr.dbg (pid=) When: @ Exception number: c0000005 (access violation)

function: supusrpd_wrk 0109de46 8bc1            mov     eax,ecx 0109de48 8d742434        lea     esi,[esp+0x34]         ss:01bee92b=???????? 0109de4c c1e902          shr     ecx,0x2 0109de4f f3a5           rep  movsd ds:00c4ff60=40404040 es:002cb428=f0f24040 0109de51 8bc8            mov     ecx,eax 0109de53 83e103          and     ecx,0x3 0109de56 f3a4            rep     movsb         ds:00c4ff60=40 es:002cb428=40 0109de58 0fbf4b0c        movsx   ecx,word ptr [ebx+0xc]     ds:0125b677=0000 0109de5c 90              nop 0109de5d 8b148d9c0a1601                                 ds:00000000=???????? mov    edx,[s1rcb+0xe25c (01160a9c)+ecx*4] FAULT ->0109de64 668b4210        mov     ax,[edx+0x10]              ds:00f9ea07=???? 0109de68 662d993a        sub     ax,0x3a99 0109de6c 0fbff0          movsx   esi,ax 0109de6f 8b04b520531301                                 ds:00c4ff60=40404040                                  mov     eax,[s1lu62x (01135320)+esi*4] 0109de76 80784401        cmp     byte ptr [eax+0x44],0x1      ds:00f9ea0e=?? 0109de7a 0f8587000000    jne     supusrpd_wrk+0x927 (0109df07) 0109de80 8b0d38120001                                   ds:01001238=6020fcfc                                  mov     ecx,[_imp____dwEnabledTraces (01001238)] 0109de86 f60104          test    byte ptr [ecx],0x4           ds:00000000=?? 0109de89 742a            jz      supusrpd_wrk+0x8d5 (0109deb5) 0109de8b 6a04            push    0x4 0109de8d 6878b70d01      push    0x10db778 0109de92 68cc030000      push    0x3cc


 * > Stack Back Trace <*

FramePtr ReturnAd Param#1 Param#2  Param#3  Param#4  Function Name 00000008 00000000 00000000 00000000 00000000 00000000 snaservr!supusrpd_wrk (FPO: [EBP 0x00000000] [0,15,4]) 00000010 00000000 00000000 00000000 00000000 00000000 snaservr!



CAUSE
The access violation occurs when an APPC session is terminated while the host security DLL (Snasii.dll) processes a single sign-on request. When an APPC session is terminated, the SNA Server service releases the internal session control block that was used for the APPC session. The access violation occurs when the host security DLL tries to access the session control block that has been released.



SNA Server 4.0
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.   Date         Time   Version     Size     File name 13-Nov-2003 19:02  4.0.0.608   468,864  Snaservr.exe 13-Nov-2003 19:02  4.0.0.608   936,368  Trcservr.exe

Note Because of file dependencies, the most recent fix that contains the previous files may also contain additional files.

Service pack information
To resolve this problem, obtain the latest service pack for Microsoft Host Integration Server 2000. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

328152 How to obtain the latest service pack for Host Integration Server 2000

Hotfix information
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel. <pre class="fixed_text">  Date         Time   Version      Size    File name --  13-Nov-2003  19:25  5.0.0.954   471,312  Snaservr.exe 13-Nov-2003 19:25  5.0.0.954 1,061,136  Trcservr.exe

Note Because of file dependencies, the most recent fix that contains the previous files may also contain additional files.

<div class="status_section">

STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.

This problem was corrected in Microsoft Host Integration Server 2000 Service Pack 2.

Keywords: kbbug kbfix kbqfe kbhotfixserver KB831896

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