Error: Access Violation in RemoveEntryList() Function of TN3270 Server

• Microsoft SNA Server, versions 4.0, 4.0 SP1, 4.0 SP2

SYMPTOMS

An access violation (AV) occurs in the TN3270 RemoveEntryList() function when a computer starts and the TN3270 Server Service is set to "On Server Startup" from the Services icon in Control Panel. A Dr.Watson log is generated when this access violation occurs similar to the following:

Application exception occurred:
        App: exe\tn3servr.dbg (<pid>)
        When: <date, time>
        Exception number: c0000005 (access violation)

function: RemoveEntryList
        672258e0 8b4c2404         mov     ecx,[esp+0x4]          ss:0e0ce29f=????????
        672258e4 8b01             mov     eax,[ecx]              ds:0c8602e4=00000000
        672258e6 8b4904           mov     ecx,[ecx+0x4]          ds:0e06ecea=????????
        672258e9 8901             mov     [ecx],eax              ds:0c8602e4=00000000
FAULT ->672258eb 894804           mov     [eax+0x4],ecx          ds:0180ea06=????????
        672258ee c20400           ret     0x4 

CAUSE

The DMOD (SNADMOD.exe) does not always cancel a pending delayed close timer when it reuses a connection.

RESOLUTION

To resolve this problem, upgrade to the latest service pack.

STATUS

Microsoft has confirmed this to be a problem in SNA Server version 4.0, 4.0 SP1, and 4.0 SP2. This problem was first corrected in Microsoft SNA Server 4.0 U.S. Service Pack 3.

For information on obtaining the 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: prodsna

Keywords : kbsna
Version : WINDOWS:4.0,4.0 SP1,4.0 SP2
Platform : WINDOWS
Issue type :