Microsoft KB Archive/195121

= SNA Server Fails With Access Violation in S1pnsuns =

Article ID: 195121

Article Last Modified on 10/27/2006

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APPLIES TO


 * Microsoft SNA Server 3.0 Service Pack 4
 * Microsoft SNA Server 4.0
 * Microsoft SNA Server 3.0 Service Pack 2
 * Microsoft SNA Server 3.0 Service Pack 3
 * Microsoft SNA Server 4.0
 * Microsoft SNA Server 4.0 Service Pack 1

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This article was previously published under Q195121





SYMPTOMS
The SNA Server service may fail unexpectedly with an access violation, causing all users to lose their SNA sessions. When this specific problem occurs, SNA Server will log the following event:   Source: SNA Server Event: 624 Creating dump file SNADUMP.LOG for snaservr.exe If Drwtsn32.exe is the default debugger, the Drwtsn32.log file will indicate an access violation fault in routine s1pnsuns. The log entry will appear as follows:   Application exception occurred:

App: snaservr.DBG (pid=164)  Exception number: c0000005 (access violation)

[...]

State Dump for Thread Id 0xa5

eax=00000000 ebx=0000009a ecx=00000000 edx=00420000 esi=01281aec edi=00000000 eip=003e1389 esp=002bfdd4 ebp=0000002f iopl=0        nv up ei pl nz na   po nc   cs=001b  ss=0023  ds=0023  es=0023  fs=0038  gs=0000  efl=00000206   function: s1pnsuns

003e1351 662d0102        sub     ax,0x201 003e1355 0fbfc8          movsx   ecx,ax 003e1358 6689842480000000 mov    [esp+0x80],ax   ss:002bfe54=0711 003e1360 8b048d80694600 mov eax,[s1scb (00466980)+ecx*4] ds:00000000=???????? 003e1367 66c74424127900  mov     word ptr [esp+0x12],0x79 ss:0089e6f8=???? 003e136e 668b9092000000  mov     dx,[eax+0x92]   ds:00000092=???? 003e1375 6689542418      mov     [esp+0x18],dx   ss:0089e6f8=???? 003e137a 0fbf480a        movsx   ecx,word ptr [eax+0xa] ds:005de923=0000 003e137e 66bb9a00        mov     bx,0x9a 003e1382 8b048dcce84400         ds:00000000=???????? mov    eax,[s1dfttmo+0x6 (0044e8cc)+ecx*4] FAULT ->003e1389 668b403e        mov     ax,[eax+0x3e]



CAUSE
The SNA Server service was attempting to process an unsolicited administrator request to start and/or stop a session after the SNA session had already ended.



SNA Server 3.0
To resolve this problem, obtain the latest service pack for SNA Server version 3.0. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

184307 How to Obtain the Latest SNA Server Version 3.0 Service Pack

SNA Server 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



WORKAROUND
This problem may occur when an administrator is manually stopping an active SNA session using the SNA Manager or MMC interface. If this administrative operation is not performed, this issue should not occur.



STATUS
Microsoft has confirmed this to be a problem in SNA Server 3.0 (including Service Packs 1 through 3), and 4.0 (including Service Pack 1). This problem was first corrected in SNA Server 3.0 Service Pack 4.

Keywords: kbbug kbfix KB195121

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