Microsoft KB Archive/196239

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

Article ID: 196239

Article Last Modified on 7/13/2004

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APPLIES TO


 * Microsoft SNA Server 2.1
 * Microsoft SNA Server 3.0
 * Microsoft SNA Server 2.11 Service Pack 1
 * Microsoft SNA Server 2.11 Service Pack 2
 * Microsoft SNA Server 3.0 Service Pack 4
 * Microsoft SNA Server 4.0
 * Microsoft SNA Server 3.0 Service Pack 2
 * Microsoft SNA Server 3.0 Service Pack 3
 * Microsoft SNA Server 4.0
 * Microsoft SNA Server 4.0 Service Pack 1

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This article was previously published under Q196239





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=



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, click the following article number to view the article in the Microsoft Knowledge Base:

184307 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: kbbug kbfix KB196239

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