SNA Server Fails With Event 686 Using Persistent Verification

ID: Q222119

The information in this article applies to:

Microsoft SNA Server, versions 3.0SP3, 4.0, 4.0SP1, 4.0SP2

SYMPTOMS

When using persistent verification on LU6.2 sessions, SNA Server may fail unexpectedly with the following event:

Event ID: 686
Source: SNA Server
Description: SNA Server Internal buffer pool error

When this occurs, all SNA Server processes must be restarted, including SnaBase and the SNA Server service.

CAUSE

To support persistent verification, the SNA Server service may be required to remove the password vector from the FMH-5 Attach request received from the SNA Server APPC DLL (Wappc32.dll). In one case, SNA Server failed to properly reformat the message, which resulted in internal SNA buffer pool corruption.

RESOLUTION

SNA Server 4.0 (post SP2)

To resolve this problem, obtain the latest service pack for SNA Server version 4.0. For additional information, please see the following article in the Microsoft Knowledge Base:

Q215838 How to Obtain the Latest SNA Server Version 4.0 Service Pack

SNA Server 3.0

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

STATUS

Microsoft has confirmed this to be a problem in SNA Server 3.0 SP3, SNA Server 4.0, 4.0 SP1 and 4.0 SP2. This problem was first corrected in SNA Server version 3.0 Service Pack 4 and SNA Server version 4.0 Service Pack 3.

Additional query words:

Keywords : sna3sp4fix sna4sp3fix
Version : WINDOWS:3.0SP3,4.0,4.0SP1,4.0SP2
Platform : WINDOWS
Issue type : kbbug