Microsoft KB Archive/161190

= TN3270 Error 520 When the Host Unbinds and Binds a Session =

Article ID: 161190

Article Last Modified on 11/26/2003

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APPLIES TO


 * Microsoft SNA Server 2.0
 * Microsoft SNA Server 2.1
 * Microsoft SNA Server 3.0
 * Microsoft SNA Server 2.11 Service Pack 1

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This article was previously published under Q161190





SYMPTOMS
The TN3270 client loses its session, receiving an error 520. The Application Event Logs on the computer running SNA Server show an event 603 with the following description:

TN3270E Service Error 520

Internal LU session state error in FirstInboundByteProcess.

State error id - 2 (expected CONT,SND,RCV).

Current state - LU-LU, SNDNXMT

The TN3270 Server traces show the following:   >09/24 10:33:35.850 (+ smidgen )  Event=TEV_DataFromSNA Thread = 0x0000010B Session = 0x00180478  Socket = 0x00000238 VCB address=0x00180684 verb_length=0x0044 verb=0x0052 (RUI)  opcode=0x8004 (WRITE) sid=0x000000A8 correlator=0x00180478  post_handle=0x00000150 prim_rc=LUA_OK sec_rc=LUA_SEC_RC_OK lu_norm   lua_data_length=0x00000000 TH Only   efi=0  oadi=0  daf=00  oaf=00  snf=0002 RH +RSP FMD fi=0  sdi=0  bci=1  eci=1  (Only) 83 80 00   dr1=1  dr2=0  ri=0   qri=0  pi=0 bbi=0 ebi=0  cdi=0  csi=0  edi=0  pdi=0

>09/24 10:33:35.850 (+ smidgen ) Event=TEV_CRTOutboundWriteComplete Thread = 0x0000010B Session = 0x00180478  Socket = 0x00000238 State = OPER       InputState = IGNORE      OutputState = SNAREAD Toggle = LU-LU      LU State = SND         CanQueue = DATAPEND Bracket = INB        DTActive

>09/24 10:33:35.860 (+ 10 msecs) Event=TEV_LogicError FirstInboundByteProcess LUSessionStateConfused



CAUSE
A session status flag in the TN3270 Server is not being reset when the host unbinds and rebinds a session.



RESOLUTION
To resolve this problem, obtain the hotfix mentioned below.



STATUS
Microsoft has confirmed this to be a problem in SNA Server versions 2.0, 2.1, 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

Additional query words: sp1 prodsna

Keywords: kbbug kbfix kbnetwork KB161190

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