This article was previously published under Q168963
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The SNA Server service (Snaservr.exe) may fail unexpectedly with anaccess violation, causing the following entry to be logged in the<Ntroot>\Drwtsn32.log file, indicating an access violation infunction "s1plgrsp":
Application exception occurred: App: snaservr.DBG (<process ID> ) When: <date> @ <time> Exception number: c0000005 (access violation) [ data omitted ] State Dump for Thread Id 0xa8 eax=00cc806c ebx=00ce3b3c ecx=00040004 edx=012623e8 esi=00000000 edi=002bff40 eip=003c93d5 esp=002bff0c ebp=00106be8 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: s1plgrsp [ data omitted ] 003c93cb c6401600 mov byte ptr [eax+0x16],0x0 003c93cf 8b07 mov eax,[edi] 003c93d1 c6401701 mov byte ptr [eax+0x17],0x1 FAULT ->003c93d5 0fbf4604 movsx eax,word ptr [esi+0x4] 003c93d9 03c6 add eax,esi *----> Stack Back Trace <----* FramePtr ReturnAd Param#1 Param#2 Param#3 Param#4 Function Name 00106be8 03830000 01030aea 00000000 01d70000 00050012 snaservr!s1plgrsp
A 3270 emulator was sending an invalid STATUS ACKNOWLEDGE (STATUS ACK)message to the SNA Server computer; the message contained no element data.A memory access violation occurred when SNA Server computer attempted toaccess this non-existent element data.
Microsoft has confirmed this to be a problem in SNA Server 2.11 and 3.0
A supported fix for SNA Server version 2.11 is now available, but has notbeen fully regression-testedand should be applied only to systemsexperiencing this specific problem.Unless you are severely impacted bythis specific problem, Microsoftrecommends that you wait for the nextService Pack that contains thisfix. Contact Microsoft Product SupportServices for more information.
This problem was corrected in the latest SNA Server version 3.0 U.S.Service Pack. For information on obtaining this Service Pack, query onthe following word in the Microsoft Knowledge Base (without the spaces):
S E R V P A C K
An update to SNA Server 2.11 (post Service Pack 2) and SNA Server 3.0(post Service Pack 1) is available to correct this problem. The updatedmodules are:
When receiving an invalid "STATUS ACK" message from a 3270 emulator,SNA Server now checks for the presence of element data, and if not it ispresent, SNA Server drops the client session and logs the following newevent:
Event ID: 62 Source: SNA Server Description: Illegal STATUS ACKNOWLEDGE message received from a client. Client Domain = <client domain> Client User Name = <user name> LU Name = <LU name.
EXPLANATION An emulator has sent an invalidly formated STATUS ACKNOWLEDGE message. The message has no element.
ACTION Contact Microsoft Technical Support.
If this event is logged, determine the emulator software and versionrunning on the client computer and reported it to Microsoft TechnicalSupport. This event indicates a software defect in the emulator softwarebeing used.