SNA Server Does Not STSN Sequence Numbers On Positive (163210)


The information in this article applies to:

  • Microsoft SNA Server 2.0, when used with:
    • the operating system: Microsoft Windows NT
  • Microsoft SNA Server 2.1, when used with:
    • the operating system: Microsoft Windows NT
  • Microsoft SNA Server 2.11, when used with:
    • the operating system: Microsoft Windows NT
  • Microsoft SNA Server 2.11 SP1, when used with:
    • the operating system: Microsoft Windows NT
This article was previously published under Q163210

SYMPTOMS

An SLI application can register a SLI_STSN_ROUTINE to handle the STSN (Set and Test Sequence Numbers) command from the host PLU. When the SLI application returns a positive response, SNA Server does not echo back the sequence numbers indicated in the STSN host request.

You may want SNA Server to send the SNA sequence numbers on every STSN response (positive or negative). SNA Server only returns the sequence numbers in the case of a TEST NEGATIVE response.

CAUSE

SNA Server does not echo back the sequence numbers in the positive case.

RESOLUTION

An update to SNA Server 2.11 Service Pack 1 is available to correct this problem. The updated modules include:

<snaroot>\SYSTEM\SNASERVR.EXE
<snaroot>\SYSTEM\WINRUI32.DLL

STATUS

Microsoft has confirmed this to be a problem in SNA Server version 2.0, 2.1, 2.11 and 2.11 SP1 (this problem is fixed in SNA Server 3.0). This problem was corrected in the latest SNA Server version 2.11 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

MORE INFORMATION

Annotated SNA Server DLC message traces are included below; these describe two scenarios where SNA Server fails to echo STSN sequence numbers on positive response.
  1. When the host sends an STSN with the SET, SET options, to which SNA Server responds with TESTPOS, TESTPOS. This is correct; however, SNA Server does NOT echo back the sequence numbers in the response.

    Host issues STSN REQUEST: SET,SET,37,0 
       DLC    ---------------------------------------------- 10:35:57.17
   DLC    01161000->0A020101 DLC DATA
   DLC                       DAF:02 OAF:01 ODAI:off Exp.
   DLC                       STSN   RQD SC  FI BC EC DR1
   DLC
   DLC    ---- Header  at address 00D14174, 1 elements ----
   DLC    06060100 00002D00 02010A88 01000D01     <......-....h....>
   DLC
   DLC    ---- Element at address 0120FB48, start 10, end 18 ----
   DLC    6B8000A2 50002500 00                    <k..sP.%..       >
    SNA Server responds with STSN REPLY: TESTPOS,TESTPOS,0,0 
       DLC    ---------------------------------------------- 10:35:58.94
   DLC    0A020101->01161000 DLC DATA
   DLC                       DAF:01 OAF:02 ODAI:off Exp.
   DLC                       STSN   +RSP SC  FI BC EC DR1
   DLC
   DLC    ---- Header  at address 00D151E8, 1 elements ----
   DLC    0100880A 00012D00 01020A88 01000D01     <..h...-....h....>
   DLC
   DLC    ---- Element at address 0120EB50, start 10, end 18 ----
   DLC    EB8000A2 50000000 00                    <...sP....       >
  2. When the host sends an STSN with the SET, SET & TEST options, to which SNA Server responds with TESTPOS, TESTNEG. This is also correct; however, SNA Server only fills in the TESTNEG sequence number in the response.

    Host issues STSN REQUEST: SET,SET&TEST,44,27 
       DLC    ---------------------------------------------- 10:40:45.11
   DLC    01161000->0A020101 DLC DATA
   DLC                       DAF:02 OAF:01 ODAI:off Exp.
   DLC                       STSN   RQD SC  FI BC EC DR1
   DLC
   DLC    ---- Header  at address 00D156C8, 1 elements ----
   DLC    06060100 00002D00 02010A9A 01000D01     <......-.........>
   DLC
   DLC    ---- Element at address 0120EFE0, start 10, end 18 ----
   DLC    6B8000A2 70002C00 1B                    <k..sp.,..       >
    SNA Server responds with STSN REPLY: TESTPOS,TESTNEG,0,25 
       DLC    ---------------------------------------------- 10:40:47.81
   DLC    0A020101->01161000 DLC DATA
   DLC                       DAF:01 OAF:02 ODAI:off Exp.
   DLC                       STSN   +RSP SC  FI BC EC DR1
   DLC
   DLC    ---- Header  at address 00D14B9C, 1 elements ----
   DLC    01009A0A 00012D00 01020A9A 01000D01     <......-.........>
   DLC
   DLC    ---- Element at address 012137BC, start 10, end 18 ----
   DLC    EB8000A2 70000000 19                    <...sp....       >
Modification Type:MajorLast Reviewed:11/26/2003
Keywords:kbnetwork KB163210 kbAudDeveloper
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