Q163578: TN3270 Client’s Session Drops
Article: Q163578
Product(s): Microsoft SNA Server
Version(s): WINDOWS:2.11,2.11 SP1
Operating System(s):
Keyword(s): kbnetwork
Last Modified: 13-JUN-2001
-------------------------------------------------------------------------------
The information in this article applies to:
- Microsoft SNA Server, versions 2.11, 2.11 SP1
-------------------------------------------------------------------------------
SYMPTOMS
========
When you are using a TN3270e client against the TN3270 service, the TN3270e
client session drops.
CAUSE
=====
The host had not yet sent a Change Direction (CD) indicator telling the TN3270
client that it had direction to send data.
RESOLUTION
==========
To resolve this problem, obtain the hotfix mentioned below. In the hotfix, the
TN3270 server discards all data received from a TN3270 emulator if the host has
not yet sent a CD message.
STATUS
======
Microsoft has confirmed this to be a problem in Microsoft SNA Server versions
2.11 and 2.11 Service Pack 1. This problem was corrected in the latest Microsoft
SNA Server 2.11 U.S. Service Pack. For information on obtaining the 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
================
SNA Server sends the TN3270 service a message inbound from the host. A TN3270
trace shows the following (notice that there is no CD bit set):
FMI ---------------------------------------------- 14:23:29.63
FMI 01020E02->0B1D0001 FMI DATA
FMI NO ACK reqd Key:312 Seq:309 BCI ECI CEI
FMI BBIUI EBIUI
FMI
FMI ---- Header at address 00DA4620, 1 elements ----
FMI 00050138 600E2C00 05010135 0100B100 <...8`.,....5....>
FMI
FMI ---- Element at address 0129B000, start 4, end 23 ----
FMI 2C000501 01350390 00F14011 F56F1D40 <,....5...1@.5o.@>
FMI 1161F013 <.a0. >
The following is the TN3270 Service sending the same message to the client:
>06/12 14:23:29.645 (+ smidgen ) Event=TEV_DataToClient
Thread = 0x000000DC Session = 0x00277598 Socket = 0x0000005C
LU-LU Data
Number of bytes = 30
>06/12 14:23:29.645 (+ smidgen ) Event=TEV_TCPSendIssued
Thread = 0x000000DC Session = 0x00277598 Socket = 0x0000005C
Number of bytes = 30
000000 0000 0100 f401 c111 086f 1d40 3c0a 5000 |....4.A..?. ..&.|
000010 3c0c 3000 3c00 0000 1108 7013 ffef |.............. |
>06/12 14:23:29.645 (+ smidgen ) Event=TEV_CRTReadProcessed
Thread = 0x000000DC Session = 0x00277598 Socket = 0x0000005C
State = OPER InputState = IDLE OutputState = TCPWRITE
Toggle = LU-LU LU State = RCV CanQueue = YES
Bracket = INB DTActive
>06/12 14:23:29.645 (+ smidgen ) Event=TEV_TCPSendCompleted
Thread = 0x000000DC Session = 0x00277598 Socket = 0x0000005C
Bytes transferred = 30
>06/12 14:23:29.645 (+ smidgen ) Event=TEV_DataToSNA
Thread = 0x000000DC Session = 0x00277598 Socket = 0x0000005C
VCB address=0x0027775C
verb_length=0x0044 verb=0x0052 (RUI) opcode=0x8003 (READ)
sid=0x00000001 correlator=0x00277598 post_handle=0x000001F8
prim_rc=LUA_OK sec_rc=LUA_SEC_RC_OK
lua_max_length=0x00000800
>06/12 14:23:29.655 (+ 10 msecs) Event=TEV_DataFromSNA
Thread = 0x000000DC Session = 0x00277598 Socket = 0x0000005C
VCB address=0x0027775C
verb in progress -- opcode=0x8003 (READ)
>06/12 14:23:29.655 (+ smidgen ) Event=TEV_CRTOutboundWriteComplete
Thread = 0x000000DC Session = 0x00277598 Socket = 0x0000005C
State = OPER InputState = IDLE OutputState = SNAREAD
Toggle = LU-LU LU State = RCV CanQueue = YES
Bracket = INB DTActive
>06/12 14:23:29.655 (+ smidgen ) Event=TEV_DataFromSNAAsync
Thread = 0x000000DC Session = 0x00277598 Socket = 0x0000005C
VCB address=0x0027775C
verb_length=0x0044 verb=0x0052 (RUI) opcode=0x8003 (READ)
sid=0x00000001 correlator=0x00277598 post_handle=0x000001F8
prim_rc=LUA_OK sec_rc=LUA_SEC_RC_OK
lu_norm lua_data_length=0x0000000B
lua_message_type=0x01 (LUA_MESSAGE_TYPE_LU_DATA)
TH Only efi=0 oadi=0 daf=05 oaf=01 snf=0135
RH REQ FMD fi=0 sdi=0 bci=1 eci=1 (Only)
03 90 00 dr1=1 dr2=0 ri=1 qri=0 pi=0
bbi=0 ebi=0 cdi=0 csi=0 edi=0 pdi=0
000000 f14011f5 6f1d4011 61f013 *1 .5?. ./0. *
>06/12 14:23:29.655 (+ smidgen ) Event=TEV_DataToClient
Thread = 0x000000DC Session = 0x00277598 Socket = 0x0000005C
LU-LU Data
Number of bytes = 18
>06/12 14:23:29.655 (+ smidgen ) Event=TEV_TCPSendIssued
Thread = 0x000000DC Session = 0x00277598 Socket = 0x0000005C
Number of bytes = 18
000000 0000 0100 f501 4011 f56f 1d40 1161 f013 |....5. .5?. ./0.|
000010 ffef |.. |
>06/12 14:23:29.665 (+ 10 msecs) Event=TEV_CRTReadProcessed
Thread = 0x000000DC Session = 0x00277598 Socket = 0x0000005C
State = OPER InputState = IDLE OutputState = TCPWRITE
Toggle = LU-LU LU State = RCV CanQueue = YES
Bracket = INB DTActive
>06/12 14:23:29.665 (+ smidgen ) Event=TEV_TCPSendCompleted
Thread = 0x000000DC Session = 0x00277598 Socket = 0x0000005C
Bytes transferred = 18
>06/12 14:23:29.665 (+ smidgen ) Event=TEV_DataToSNA
Thread = 0x000000DC Session = 0x00277598 Socket = 0x0000005C
VCB address=0x0027775C
verb_length=0x0044 verb=0x0052 (RUI) opcode=0x8003 (READ)
sid=0x00000001 correlator=0x00277598 post_handle=0x000001F8
prim_rc=LUA_OK sec_rc=LUA_SEC_RC_OK
lua_max_length=0x00000800
>06/12 14:23:29.665 (+ smidgen ) Event=TEV_DataFromSNA
Thread = 0x000000DC Session = 0x00277598 Socket = 0x0000005C
VCB address=0x0027775C
verb in progress -- opcode=0x8003 (READ)
>06/12 14:23:29.665 (+ smidgen ) Event=TEV_CRTOutboundWriteComplete
Thread = 0x000000DC Session = 0x00277598 Socket = 0x0000005C
State = OPER InputState = IDLE OutputState = SNAREAD
Toggle = LU-LU LU State = RCV CanQueue = YES
Bracket = INB DTActive
>06/12 14:23:32.159 (+ 2 secs ) Event=TEV_TCPRecvCompleted
Thread = 0x000000DC Session = 0x00277598 Socket = 0x0000005C
Bytes returned = 10
The following is the client sending data to the TN3270 service when it does
not have direction to send:
>06/12 14:23:32.159 (+ smidgen ) Event=TEV_DataFromClient
Thread = 0x000000DC Session = 0x00277598 Socket = 0x0000005C
000000 0000 0100 e87d 61f0 ffef |....Y'/0.. |
The following is the TN3270 service rejecting the client's message:
>06/12 14:23:32.179 (+ 20 msecs) Event=TEV_LogicError
InboundLULUData
LUSessionStateConfused
FMI ---------------------------------------------- 14:23:32.25
FMI 0B1D0001->01020502 CLOSE SSCP REQUEST
FMI
FMI ---- Header at address 00DA4620, 0 elements ----
FMI 01010001 600E2C00 05010135 0100C800 <....`.,....5..H.>
FMI ---------------------------------------------- 14:23:32.26
FMI 01020502->0B1D0001 CLOSE SSCP RSP OK
FMI
FMI ---- Header at address 00DA4620, 0 elements ----
FMI 02010001 600E2C00 05010135 0100C800 <....`.,....5..H.>
Additional query words: sp1 prodsna
======================================================================
Keywords : kbnetwork
Technology : kbAudDeveloper kbSNAServSearch kbSNAServ211 kbSNAServ211SP1
Version : WINDOWS:2.11,2.11 SP1
Issue type : kbbug
Solution Type : kbfix
=============================================================================
THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.
Copyright Microsoft Corporation 1986-2002.