SNA Manage Agent Traps After Saving Configuration Change

• Microsoft SNA Server, versions 3.0, 3.0 SP1

SYMPTOMS

After you make a configuration change using SNA Manager, the SNA Server Manage Agent process (Mngagent.exe) may encounter an access violation, causing the SNA Server status in Manager to appear as offline. The SNA Server service will continue to run properly, but no status information is displayed for the server.

When this problem occurs, the following <ntroot>\Drwtsn32.log entry is logged:

Application exception occurred:
App: mngagent.dbg (<process ID>)
Exception number: c0000005 (access violation)

CAUSE

This problem is rare. An uninitialized variable leads to a Manage Agent access violation in CAgtPxyRecExchange::SendModifyUse.

RESOLUTION

To resolve this problem:

• Manually restart the SNA Manage Agent (Mngagent.exe) on the SNA Server computer.

STATUS

Microsoft has confirmed this to be a problem in SNA Server versions 3.0 and 3.0 Service Pack 1 (SP1). 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

   State Dump for Thread Id <thread>

   eax=00000000 ebx=00000002 ecx=0035ebb0 edx=003cc174 esi=0038ff00
   edi=0000000a
   eip=0100cb97 esp=0131fe3c ebp=0d83cff0 iopl=0         nv up ei pl zr na
   po nc
   cs=001b  ss=0023  ds=0023  es=0023  fs=0038  gs=0000
   efl=00000246

   function: CAgtPxyRecExchange::SendModifyUse
        0100cb79 85c0             test    eax,eax
        0100cb7b 7407            jz CAgtPxyRecExchange::SendModifyUse+0x84
   (0100cb84)
        0100cb7d 8b4808           mov     ecx,[eax+0x8]
   ds:0068e922=????????
        0100cb80 894c2428         mov     [esp+0x28],ecx
  ss:019ae75f=????????
        0100cb84 837d0800         cmp    dword ptr [ebp+0x8],0x0
   ss:0decb912=????????
        0100cb88 747c           jz CAgtPxyRecExchange::SendModifyUse+0x106
   (0100cc06)
        0100cb8a 837c242800       cmp   dword ptr [esp+0x28],0x0
   ss:019ae75f=????????
        0100cb8f 747c           jz CAgtPxyRecExchange::SendModifyUse+0x10d
   (0100cc0d)
        0100cb91 f6450c04         test    byte ptr [ebp+0xc],0x4
   ss:0decb912=??
        0100cb95 7506           jnz CAgtPxyRecExchange::SendModifyUse+0x9d
   (0100cb9d)
   FAULT ->0100cb97 f6400c04         test    byte ptr [eax+0xc],0x4
   ds:0068e922=??

   *----> Stack Back Trace <----*

   FramePtr ReturnAd Param#1  Param#2  Param#3  Param#4  Function Name
   0131fe64 01001ea8 00000000 0dbacff0 0038ff00 003d5750
   mngagent!CAgtPxyRecExchange::SendModifyUse (FPO: [EBP 0x0131fe9c]
   [5,7,4])

   0131fe8c 6098b267 0131fe9c 00000002 0038fec0 00000b22
   mngagent!CStdAgentProxy::OnModify

   (FPO: [EBP 0x0131ffb8] [1,0,4])
   0131fea8 01008ca5 61490c40 00000000 0121ffb8 77fa1773
   mngbase!CNotifyQueue::Dispatch  (FPO: [0,4,1])

   0131ffb8 77f46c2e 0121ffb8 61490c40 00000000 0121ffb8
   mngagent!DoAgentProxy (UKNOWN FPO TYPE)

   61490c40 1274c085 7401f883 02f8831a 01b85a74 c2000000
   kernel32!BaseThreadStart 

Additional query words:

Keywords : kbnetwork snamanager kbfix3.00.sp2
Version : WINDOWS:3.0,3.0 SP1
Platform : WINDOWS
Issue type : kbbug