SNA 3.0 TN3270 or TN5250 Server Traps When Configuration Saved
ID: Q178492
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The information in this article applies to:
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Microsoft SNA Server, versions 3.0, 3.0 SP1, 3.0 SP2
SYMPTOMS
The TN3270 or TN5250 service may end unexpectedly with an access violation
when saving the configuration file, even if the configuration file changes
do not affect these services. This problem can occur if the SNA Server
Manage Agent service (Mngagent.exe) is restarted on the SNA Server. The
following symptoms will occur when this problem happens:
- All TN3270 or TN5250 client users will lose their sessions and the TN3270
or TN5250 Server service will no longer be running.
- The following event will be logged in the Windows NT application event log:
Event ID: 624
Source: TN3270 Server (or TN5250 Server)
Description: Creating dump file <snaroot>\traces\snadump.log for
<tn3servr.exe | tn5250.exe >
- A new entry will be created in the <ntroot>\drwtsn32.log file (the failing
routine in mngbase.dll is the same for both TN3270 or TN5250):
Application exception occurred:
App: exe\tn3servr.dbg (<process id>)
Exception number: c0000005 (access violation)
[...]
State Dump for Thread Id <thread id>
eax=0c9dfda4 ebx=77e7a69f ecx=0b5f0000 edx=42008000 esi=00000003
edi=00000003 eip=6098d4c8 esp=0c9dfd98 ebp=77e719c8 iopl=0
nv up ei pl nz na po nc
cs=001b ss=0023 ds=0023 es=0023 fs=0038 gs=0000 efl=00000206
function: MngGetRectypeChangeMask
6098d4a6 6a00 push 0x0
6098d4a8 682c1400c0 push 0xc000142c
6098d4ad 6a01 push 0x1
6098d4af e8fc010000 call MngReportToEventLog (6098d6b0)
6098d4b4 33c0 xor eax,eax
6098d4b6 33d2 xor edx,edx
6098d4b8 5e pop esi
6098d4b9 81c4a0000000 add esp,0xa0
6098d4bf c20400 ret 0x4
6098d4c2 81e6ffff0000 and esi,0xffff
FAULT ->6098d4c8 8b84f1a0010000 mov eax,[ecx+esi*8+0x1a0]
*----> Stack Back Trace <----*
Function Name
mngbase!MngGetRectypeChangeMask
mngbase!MngIsRectypeChanged
mngext!Mng_IsRectypeChanged
tn3servr!Tn3ManageActionEx
tn3servr!Tn3ManageActionEx
tn3servr!Tn3ManageActionEx
mngext!CMngExtSink::OnCommand
mngbase!CNotifyQueue::Dispatch
mngbase!CNotifyQueue::ProcessWait
mngext!Mng_IsRectypeChanged
kernel32!BaseThreadStart
tn3 servr!<nosymbols>
CAUSE
When the configuration file changes, the TN3270 and TN5250 services are
both notified and attempt to handle dynamic changes to their configuration
data. However, if the mngagent service had been stopped and restarted, the
configuration data location within the Manage shared memory may change,
causing the services to access an invalid memory location causing an
access violation.
WORKAROUND
Do not stop and restart the SNA Server Manage Agent service (Mngagent.exe).
STATUS
Microsoft has confirmed this to be a problem in SNA Server 3.0 (including
SP1 and SP2).
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
Additional query words:
Keywords : prodsna snatn3270 kbbug3.00.sp2 kbfix3.00.sp3 kbbug3.00.sp1 snamanager snatn5250
Version : WINDOWS:3.0,3.0 SP1,3.0 SP2
Platform : WINDOWS
Issue type : kbbug