SNA Applications That Are Configured to Use SSO May Experience Delays When Connecting to IBM Hosts (829921)


The information in this article applies to:

  • Microsoft Host Integration Server 2000
  • Microsoft Host Integration Server 2000 SP1
  • Microsoft SNA Server 4.0
  • Microsoft SNA Server 4.0 SP1
  • Microsoft SNA Server 4.0 SP2
  • Microsoft SNA Server 4.0 SP3
  • Microsoft SNA Server 4.0 SP4

SYMPTOMS

Microsoft SNA Server applications that are configured to use single sign-on (SSO) may experience delays when connecting to IBM mainframe computers or to AS/400-based computers. When a delay occurs, users may notice that a transaction that was initiated by an application takes noticeably longer to complete. If the application is configured with a timeout, users may notice that the transaction is canceled because of the long delay in processing the SSO request.

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.

CAUSE

The SNA Server host security DLL file, Snasii.dll, calls the ReleaseSemaphore() function to signal the pool of worker threads when a new SSO account lookup is added to an internal memory queue. However, the function that calls ReleaseSemaphore() does not check the return code to determine whether the ReleaseSemaphore() call completed successfully.

If ReleaseSemaphore() is unsuccessful, the worker threads that process the SSO account lookup requests are not signalled. Because not all the worker threads are used, processing the SSO account lookup requests is slower. This results in response times that are unusually slow for the SNA application.

RESOLUTION

This section provides fixes for the following applications:

Microsoft SNA Server 4.0

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

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

http://support.microsoft.com/contactus/?ws=support

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 usual 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 hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
   Date         Time   Version      Size    File name
   ------------------------------------------------------
   01-Oct-2003  23:59  4.0.0.608    16,176  Nthstreg.dll     
   01-Oct-2003  23:59  4.0.0.608    45,248  Sec400.dll
   01-Oct-2003  23:59  4.0.0.608    32,608  Snahsmsg.dll
   02-Oct-2003  00:00  4.0.0.608   149,280  Snapwchg.dll
   01-Oct-2003  23:59  4.0.0.608   138,848  Snarpc.dll
   02-Oct-2003  00:00  4.0.0.608    44,800  Snasii.dll
   02-Oct-2003  00:00  4.0.0.608    15,280  Udsuppnt.dll
   01-Oct-2003  23:59  4.0.0.608    88,736  Hostproc.exe
   02-Oct-2003  00:00  4.0.0.608   136,272  Snapmp.exe       
   02-Oct-2003  00:00  4.0.0.608   323,984  Snaudb.exe
   02-Oct-2003  00:00  4.0.0.608    54,736  Udconfig.exe
Note Because of file dependencies, the most recent fix that contains the preceding files may also contain additional files.

Microsoft Host Integration Server 2000

Service pack information

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

328152 How to obtain the latest service pack for Host Integration Server 2000

Hotfix information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
   Date         Time   Version      Size    File name
   ------------------------------------------------------
   31-Oct-2003  21:47  5.0.0.948   119,056  Hsdbrepl.dll
   31-Oct-2003  21:47  5.0.0.948   155,920  Snapwchg.dll
   31-Oct-2003  21:47  5.0.0.948   147,728  Snarpc.dll
   31-Oct-2003  21:47  5.0.0.948    53,520  Snasii.dll
   31-Oct-2003  21:47  5.0.0.948   147,728  Snapmp.exe
   31-Oct-2003  21:47  5.0.0.948   360,720  Snaudb.exe
   31-Oct-2003  21:47  5.0.0.948   127,248  Udbmgmt.exe
   31-Oct-2003  21:47  5.0.0.948    57,616  Udconfig.exe

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 in the "Applies to" section.

This problem was corrected in Microsoft Host Integration Server 2000 Service Pack 2.
Modification Type:MinorLast Reviewed:10/26/2005
Keywords:kbHotfixServer kbQFE kbHotfixServer kbQFE kbQFE kbfix kbbug KB829921 kbAudDeveloper
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