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Article ID: 153457 - Last Review: March 17, 2005 - Revision: 3.1
Host TPX Application Problem Leads to 3270 Emulator 2004 Error
This article was previously published under Q153457
When you use TPX version 4.0.03 on an IBM MVS system (MVS v5.1 and
VTAM v4r2), you will get the following Windows NT application
event log entry indicating a 3270 emulation error using SNA Server and
Wall Data Rumba.
Event 21
Negative response sent on connection <value> (SENSE = 2004)
Where 2004 indicates a DIRECTION ERROR. See the "IBM SNA Formats
Guide" (IBM part number GA27-3136) for a description of SNA sense code
errors.
NOTE: If this specific problem occurs, it would occur with any 3270
emulator. To confirm this is the problem, SNA Server DLC and 3270
message traces should be captured.
The TPX host application sends a message to the 3270 emulator when it did
not have the direction flag. An SNA Server DLC message trace shows the
following message sequence:
SNA Server Host (TPX)
--------------------------------------------------------
<- BIND (appname = "TPX")
BIND +RSP ->
<- SDT
SDT +RSP ->
RQE FMD BC EC DR1 BB CD ->
(User Request)
<- RQE FMD BC EC DR1 CD
(TPX response)
RQE FMD BC EC DR1 CD BBIU ->
(Security system screen)
(second part) EBIU ->
<- RQE FMD BC EC DR1 CD
(TPX response)
<- RQE FMD BC EC DR1 EB
(NCCF NETVIEW screen data)
-RSP FMD SD BC EC DR1 ->
(sense code 20040000)
In the above flow diagram, the TPX application sends an FMD message (the
NCCF Netview screen) after it is already sent the Change Direction flag on
the previous message. This is an SNA protocol violation that causes SNA
Server to send a 2004 error (direction error).
APPLIES TO
- Microsoft SNA Server 2.0, when used with:
- Microsoft SNA Server 2.1, when used with:
- Microsoft SNA Server 2.11 Service Pack 1, when used with:
- Microsoft SNA Server 2.11 Service Pack 2, when used with:
- Microsoft SNA Server 4.0, when used with:
- Microsoft SNA Server 3.0 Service Pack 2, when used with:
- Microsoft SNA Server 3.0 Service Pack 3, when used with:
- Microsoft SNA Server 3.0 Service Pack 4, when used with:
- Microsoft SNA Server 4.0, when used with:
- Microsoft SNA Server 4.0 Service Pack 1, when used with:
- Microsoft SNA Server 4.0 Service Pack 2, when used with:
- Microsoft SNA Server 4.0 Service Pack 3, when used with:
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