Summary: The SNA Server service (snaservr.exe) may fail with an access violation
while supporting Attachmate Extra! 3270 client sessions. The failure may
be recorded in the <ntroot>\DRWTSN32.LOG file as follows:
Application exception occurred:
App: snaservr.DBG (pid=<number>)
Exception number: c0000005 (access violation)
State Dump for Thread Id 0xf1
eax=00000000 ebx=00000001 ecx=011b0000 edx=00cc46bc esi=011bf900 edi=0041617c
eip=003983b9 esp=002cff10 ebp=00000000 iopl=0 nv up ei pl nz na pe nc
cs=001b ss=0023 ds=0023 es=0023 fs=0038 gs=0000 efl=00000202
00398391 0fbfc1 movsx eax,cx
00398394 8b04857c614100 ds:00000000=????????
mov eax,[s1mode+0x380c (0041617c)+eax*4]
0039839b 6683781806 cmp word ptr [eax+0x18],0x6 ds:0087e923=????
003983a0 7404 jz s1pufnty+0x36 (003983a6)
003983a2 668b480c mov cx,[eax+0xc] ds:0087e923=????
003983a6 0fbfc1 movsx eax,cx
003983a9 8b542408 mov edx,[esp+0x8] ss:00b4e833=????????
003983ad 8d3c857c614100 ds:00000000=????????
lea edi,[s1mode+0x380c (0041617c)+eax*4]
003983b4 8b7204 mov esi,[edx+0x4] ds:01542fde=????????
003983b7 8b07 mov eax,[edi] ds:0041617c=00000000
FAULT ->003983b9 80782c04 cmp byte ptr [eax+0x2c],0x4 ds:0087e922=??
*----> Stack Back Trace <----*
FramePtr ReturnAd Param#1 Param#2 Param#3 Param#4 Function Name
00000000 00000000 00000000 00000000 00000000 00000000 snaservr!s1pufnty
0000000c 00000000 00000000 00000000 00000000 00000000 snaservr!<nosymbols>
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Manual ResolutionsAn update to the SNA Server service is available which performs additional validation checking on Close(SSCP) requests to prevent this access violation. If SNA Server detects that an emulator sent an invalid request, the server will now drop the message, disconnect the client connection, and log the following event: Event ID: 9
Source: SNA Server
Description: (1117) Internal message sequence error
X'1117' Received an invalid message from a 3270 emulator NOTE: Event 9 may also indicate a minor error not indicative of this problem or even a session loss. This event will be enhanced in a future version of SNA Server to indicate additional details of this error including the client machine which caused the event to occur.
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