5250 Emulator Won't Connect Even Though Sessions Are Available
ID: Q166875
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The information in this article applies to:
-
Microsoft SNA Server, versions 2.11, 3.0
SYMPTOMS
When connecting to an AS/400, the 5250 applet shows Not Connected in
the lower left corner. SNA Server shows that there are sessions
available for the LU-LU pair the 5250 applet is attempting to use.
However, some of these LUs on the AS/400 are in an Active - Detached
state, thereby preventing the request for conversation from succeeding.
The same thing will happen with other 5250 emulators. However, the message
displayed in the emulator may be different.
NOTE: There are various situations in which you might see a Not Connected
5250 status. This article documents one possible situation. For other
possible situations, see the following Microsoft Knowledge Base article:
Q150796 5250 Emulator Displays a BlackScreen Then Disconnects
CAUSE
The exact cause of why the AS/400 sometimes shows sessions in an Active -
Detached state is unknown.
WORKAROUND
To work around this problem, apply the fix referenced below, and then edit
the registry as follows.
NOTE: You must first apply the fix referenced below before editing the
registry.
WARNING: Using Registry Editor incorrectly can cause serious, system-wide
problems that may require you to reinstall Windows NT to correct them.
Microsoft cannot guarantee that any problems resulting from the use of
Registry Editor can be solved. Use this tool at your own risk.
- Start Registry Editor (Regedt32.exe or Regedit.exe, as appropriate for
your version of Windows NT).
- Go to the following key in the registry:
HKEY_LOCAL_ MACHINE\SYSTEM\CurrentControlSet\Services\SnaServr\
Parameters
- On the Edit menu, click Add Value and use the following entry:
Value Name: SessionLimitMargin
Data Type: REG_SZ
This registry entry artificially lowers the number of post cnos
negotiation by the value specified. Therefore, if the negotiated session
limit for an LU-LU-MODE triplet is 8 and SessionLimitMargin is 2, the
SNA Server service node will only start 6 sessions on the triplet.
- Exit Registry Editor.
This will work around the problem where SNA Server thinks it has sessions
available and the AS/400 does not.
STATUS
Microsoft has confirmed this to be a problem in SNA Server versions 2.11
and 3.0. This problem was corrected in the latest SNA Server version 3.0
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
The following will be seen in an SNA Server DLC trace:
The SNA Server service, thinking it has sessions available for a
conversation request, sends an Attach (02ff) for conversation to the
AS/400:
DLC ---------------------------------------------- 22:00:54.97
DLC 01020601->04160005 DLC DATA
DLC DAF:36 OAF:01 ODAI:off Normal
DLC RQE FMD FI BC EC DR1 PI CD
DLC
DLC ---- Header at address 00CC45EC, 1 elements ----
DLC 0B05537E 324F2C00 36010001 01001121 <..S~2O,.6......!>
DLC
DLC ---- Element at address 011C68C8, start 10, end 233 ----
DLC 0B91203F 0502FF18 03D00040 0430F0F0 <.j ?.......@.000>
DLC F50F0402 D7C3E209 014AB1D6 5ACABB72 <5...PCS..J.OZ..r>
DLC 8A160DC1 D7D7D54B D4E2E2D5 C1E2F1F6 <...APPNKMSSNAS16>
DLC 54310016 0A040001 00080000 00000000 <T1..............>
DLC 0001009E 12F5009A 12E20096 12A02000 <.....5...S.o.. .>
DLC 05100100 000023D9 E8C1D5C1 D7D7C1F1 <......#RYANAPPA1>
DLC 40F3F1F9 F74040C3 F2404040 40000000 <@3197@@C2@@@@...>
DLC 00000000 00000000 000026C4 E4E2C200 <..........&DUSB.>
DLC F6F9F740 F0F3F740 40404040 40404040 <697@037@@@@@@@@@>
DLC 40404040 40404040 40E7F900 00000000 <@@@@@@@@@X9.....>
DLC 41C10000 00004040 40404040 4040D7C3 <AA....@@@@@@@@PC>
DLC E2404040 40404040 D7C3E240 40404040 <S@@@@@@@PCS@@@@@>
DLC 40402040 40404040 40404040 40404040 <@@ @@@@@@@@@@@@@>
DLC 40404040 40404040 40404040 40404040 <@@@@@@@@@@@@@@@@>
The AS/400 rejects the Attach with a 0846 0000 sense code promising the SNA
Server the real error in a following message:
DLC ---------------------------------------------- 22:00:56.66
DLC 04160005->01020601 DLC DATA
DLC DAF:01 OAF:36 ODAI:off Normal
DLC -RSP FMD SD BC EC DR1
DLC
DLC ---- Header at address 00CC6AE4, 1 elements ----
DLC 0B05537E 324F2C00 01368000 0100BB00 <..S~2O,..6......>
DLC
DLC ---- Element at address 011C68C8, start 10, end 16 ----
DLC 87900008 460000 <g...F.. >
Here is the actual error from the AS/400:
DLC ---------------------------------------------- 22:00:56.87
DLC 04160005->01020601 DLC DATA
DLC DAF:01 OAF:36 ODAI:off Normal
DLC RQE FMD FI BC EC DR1 PI CEB
DLC
DLC ---- Header at address 00CC5FEC, 1 elements ----
DLC 0B05537E 324F2C00 01360001 0100BB00 <..S~2O,..6......>
DLC
DLC ---- Element at address 011C5440, start 10, end 19 ----
DLC 0B910107 07084B60 3100 <.j....K`1. >
Primary Sense: 084B - Requested Resources Not Available
Secondary Sense: 6031 - Transaction Program Not Available - Retry
Available.
See SNA Formats Guide for the full text message.
The third-party products discussed here are manufactured by vendors
independent of Microsoft; we make no warranty, implied or otherwise,
regarding these products' performance or reliability.
Additional query words:
Keywords : kbnetwork sna5250 snaserverservice kbfix3.00.sp2
Version : WINDOWS:2.11,3.0
Platform : WINDOWS
Issue type :