Microsoft KB Archive/296078

= Application Exception in Snaservr.exe After Event 102 X'0BC6' =

Article ID: 296078

Article Last Modified on 2/22/2007

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APPLIES TO


 * Microsoft SNA Server 4.0 Service Pack 2
 * Microsoft SNA Server 4.0 Service Pack 3
 * Microsoft SNA Server 4.0 Service Pack 4
 * Microsoft Host Integration Server 2000 Standard Edition

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This article was previously published under Q296078



SYMPTOMS
The SNA Server service (Snaservr.exe) may terminate unexpectedly on an SNA Server or Host Integration Server (HIS) 2000 system when providing LU 6.2 sessions to APPC (Advanced Program-to-Program Communciations) applications that call the APPC ACTIVATE_SESSION verb.

If Drwtsn32.exe is configured as the system's default debugger, the Drwtsn32.log will be updated with information that resembles the following:

Application exception occurred:

App: exe\snaservr.DBG (pid=

When: @

Exception number: 80000003 (hardcoded breakpoint)

The SNA or HIS 2000 server will log the following event just prior to the application exception:

Event ID: 102

Source: SNA Server

Description: (0BC6) Internal Error

Subcode Information: X'0BC6' Free active pool is empty.



CAUSE
The SNA Server service fails to release an internal control block that is used for CNOS (Change Number of Sessions) negotiations for each client APPC application that issues an ACTIVATE_SESSION verb. SNA Server and HIS 2000 support a fixed number of these special control blocks; therefore, over time this type of control block leak leads to a situation in which there are no available control blocks. When this occurs, the SNA Server service logs the Event 102 Subcode X'0BC6' and terminates abnormally.



SNA Server 4.0
A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem. This fix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next Microsoft SNA Server version 4.0 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix should have the following file attributes or later:

NOTE: Because of file dependencies, the most recent fix that contains the preceding files may also contain additional files.

Host Integration Server 2000
To resolve this problem, obtain the latest service pack for Host Integration Server 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

328152 How to Obtain the Latest Host Integration Server 2000 Service Pack

The English version of this fix should have the following file attributes or later:

NOTE: Because of file dependencies, the most recent fix that contains the preceding files may also contain additional files.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Host Integration Server 2000 Service Pack 1.



MORE INFORMATION
A single control block is leaked for each client connection to the SNA Server service over which an APPC application issues an ACTIVATE_SESSION verb. A control block is not leaked for each ACTIVATE_SESSION verb that is issued by the application after the client connection is established.

ACTIVATE_SESSION and DEACTIVATE_SESSION support was added in SNA Server 4.0 SP2. For additional information on these APPC verbs, click the article number below to view the article in the Microsoft Knowledge Base:

195010 Activate_session/Deactivate_session Unavailable in SNA Server

Keywords: kbbug kbfix kbhostintegserv2000presp1fix kbhostintegserv2000sp1fix KB296078

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