Article ID: 826438
Article Last Modified on 10/26/2005
APPLIES TO
- Microsoft Host Integration Server 2000 Standard Edition
- Microsoft Host Integration Server 2000 Service Pack 1
SYMPTOMS
When the SNA Print service is running multiple 3270 LU1 printer sessions at the same time, the SNA Print service may, under stress, send a negative acknowledgement to a BID request after the bracket is already open and the BID request has already been acknowledged. When this behavior occurs, the SNA Server service recognizes that this is a session error and ends the session. When this error occurs, all printing for the session stops, and print jobs may queue up on the host system.
SNA Server also logs the following event in the application event log:
Event Type: Warning
Event Source: SNA Server
Event Category: None
Event ID: 12
Description: A 3270 Session was lost due to a protocol error in the 3270 emulator. A user has lost their 3270 session due to a non-recoverable protocol error caused by the 3270 emulator being used. The following user encountered this error.
Client Domain: domainname
Client User: username
LU name: LUNAME
FMI Sense Code: 4011
CAUSE
Because of timing issues in the SNA Print service, and because of the use of certain internal data structures, the BID request for one print session may be processed by another print session.
RESOLUTION
Service pack information
To resolve this problem, obtain the latest service pack for Microsoft Host Integration Server 2000. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
328152 How to obtain the latest service pack for Host Integration Server 2000
Hotfix information
The English version of this fix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
Date Time Version Size File name
--------------------------------------------------------------
12-Aug-2003 00:28 5.0.0.935 20,752 Msg5250.dll
12-Aug-2003 00:28 5.0.0.935 250,128 Ppd3270.dll
12-Aug-2003 00:28 5.0.0.935 139,536 Ppd5250.dll
12-Aug-2003 00:28 5.0.0.935 49,424 Prmngext.dll
12-Aug-2003 00:27 5.0.0.935 209,168 Snacfg.dll
12-Aug-2003 00:28 5.0.0.935 24,848 Snaxlt.dll
12-Aug-2003 00:28 5.0.0.935 282,896 Winvprt.dll
12-Aug-2003 00:28 5.0.0.935 57,616 Pdfcomp.exe
12-Aug-2003 00:28 5.0.0.935 94,480 Snaprint.exe
NOTE: Because of file dependencies, the most recent fix that contains the preceding files may also contain additional files.
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
This problem was corrected in Microsoft Host Integration Server 2000 Service Pack 2.
MORE INFORMATION
When you examine SNA traces of this problem, you notice the following data flow. This data flow shows that the SNA Print service sends a second (negative) acknowledgement after the SNA Print service has already responded to the BID request:
Host System SNA Server service SNA Print service
=========== ================== =================
Print Data (BB EB) ->
BID ->
<- BID ACK
Print Data ->
BETB ->
<- BID NACK
<- +RSP
Keywords: kbbug kbfix kbqfe kbhotfixserver KB826438
