Microsoft KB Archive/282752

= DEACTIVATE_SESSION Verb May Cause Snaservr.exe to Stop Responding (Hang) =

Article ID: 282752

Article Last Modified on 2/21/2007

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APPLIES TO


 * 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 Q282752



SYMPTOMS
The SNA Server service (Snaservr.exe) may exhibit one of the following symptoms when it receives a DEACTIVATE_SESSION verb from an Advanced Program-to-Program Communications (APPC) application:
 * High CPU (for example, 99% - 100%) use for the SNA Server (Snaservr.exe) process. -or-


 * SNA Server service stops responding (hangs) when terminating the APPC application that issued the DEACTIVATE_SESSION verb.



CAUSE
If the SNA Server service receives a DEACTIVATE_SESSION (All Sessions) verb at the same time as an UNBIND request for one of the sessions that is being deactivated, the SNA Server service may experience one of the two problems described in the &quot;Symptoms&quot; session.

If the DEACTIVATE_SESSION verb is received just prior to the UNBIND request, the SNA Server service will stop responding (hang). If the UNBIND request is received just prior to the DEACTIVATE_SESSION verb, the SNA Server service will show 100% CPU use.



SNA Server
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:

'SNA Server 4.0'

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



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
For more information on the DEACTIVATE_SESSION and ACTIVATE_SESSION verbs, please refer to the APPC Programmer's Guide in the SNA Server 4.0 SP3 (or later) and Host Integration Server 2000 SDK.

For additional information about these two APPC verbs, click the article numbers below to view the articles in the Microsoft Knowledge Base:

195010 Activate_session/Deactivate_session Unavailable in SNA Server

263096 ACTIVATE_SESSION Event Not Signaled When the Session Ends

245966 Winmgt32.dll May Complete Same Verb Three Times

279879 Problems with Processing Of Asynchronous CNOS and DISPLAY Verbs

282461 DEACTIVATE_SESSION Returns Parameter_Check If No Sessions Are Active

Additional query words: Snaservr sp3 sp4 service pack

Keywords: kbbug kbfix kbhostintegserv2000presp1fix kbhostintegserv2000sp1fix KB282752

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