SNA Server Fails With Event 686 Using Persistent Verification (222119)

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

215838 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, 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

STATUS

Microsoft has confirmed that this is 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.