SNA Client for Windows NT Hangs When Receiving PID > '0x8000'

• Microsoft SNA Server, versions 2.1, 2.11, 3.0, 4.0
• Microsoft SNA Server version 2.11 Service Packs 1 and 2
• Microsoft SNA Server version 3.0 Service Packs 1, 2, and 3
• Microsoft SNA Server version 4.0 Service Pack 1

SYMPTOMS

An SNA Client for Windows NT hangs when it gets an assigned Process ID (PID) larger than '0x8000'. In addition, an event similar to the following may be logged in the Windows NT Application Event Log:

   Event ID: 556 

   Description: A system error occurred while making a pipe connection,
   rc=<value> 

CAUSE

The SNA Server client for Windows NT does not correctly handle 32-bit PIDs. AFter the system starts using PIDs greater than '0x8000', this problem will occur.

RESOLUTION

To resolve this problem, obtain the latest service pack for SNA Server version 3.0. For additional information, please see the following article in the Microsoft Knowledge Base:

Q184307 How to Obtain the Latest SNA Server Version 3.0 Service Pack

WORKAROUND

Restarting the server will reset the PID values below 8000h, which fixes the problem until the system starts to use PID values >=8000h again.

STATUS

Microsoft has confirmed this to be a problem in SNA Server versions 2.1, 2.11, 2.11 SP1, 2.11 SP2, 3.0, 3.0 SP1, 3.0 SP2, 3.0 SP3, 4.0, and 4.0 SP1. This problem was first corrected in SNA Server 3.0 Service Pack 4.

MORE INFORMATION

Below is an excerpt of the internal trace captured on a SNA Client for Windows NT that shows a PID of '0xFFFF8D76';

New RAM pipe message, srcl=0, destl=2 Next ltab entry to look from 19 LTAB entry 19 allocated, ltab[i]->inuse = 513 New RAM pipe, his l 1 mapped to ltab index 19, addr 117F1008 from BK02936 running SERVERCO on SSEBASTIANAG2 Client App does not use Extended L-values pSPd->Pid = FFFF8D76, pSPd->pProcessHdr = 00000180 LPd 0 is free First init Saved PID = FFFF8D76 Failed to open to remote process FFFF8D76, rc = 00000057 --> RAM Pipe could not be opened ltabptr 117F1008 Secstatus = 00000002 Logging 2 chars, level = 12, msgnum = 556 pLog at 001AC3B8, pTokenUser at 001AC3D4 Signaling the Logging thread CloseDmodConnection, L table entry 19, CliCount 65492

Additional query words: snadmod

Keywords :
Version : WINDOWS:2.1,2.11,2.11SP1,2.11SP2,3.0,3.0SP1,3.0SP2,3.0SP3,4.0,4.0SP1
Platform : WINDOWS
Issue type : kbbug