Q320010: 100 % CPU Utilization and Event ID 8 Warnings After MC_ALLOCATE

Article: Q320010
Product(s): Microsoft SNA Server
Version(s): 
Operating System(s): 
Keyword(s): kbenv kbtool
Last Modified: 22-MAY-2002

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The information in this article applies to:

- Microsoft Host Integration Server 2000 
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SYMPTOMS
========

An APPC transaction program may cause Host Integration Server 2000 to log
multiple Event ID 8 messages and cause CPU utilization to reach 100 percent.

Details of the Event ID 8
-------------------------

Event Type:	Warning
Event Source:	SNA Server
Event Category:	None
Event ID:	8
Description:
(1174) Internal Protocol Violation

EXPLANATION
A protocol violation has occurred at the interface between the SNA 
Service and another SNA component (for example, the emulator or link 
service).

SUBCODE INFORMATION
X'1105'  Insufficient space to copy data into node buffer.
X'1112'  Received unknown message type at the node interface.
X'1144'  Received illegal message at the node interface.
X'1151'  Received unrecognized message from the link service component.
X'1174'  Received invalid session limits message from Host Integration 
         Server SNA Manager.
X'1175'  Received invalid CNOS command.
X'1188'  Received invalid CNMS message.

ACTION
Provide network support personnel with the event log file(s) related to
SNA, SNA trace file(s), and the number and description of the displayed 
subcode. For information about SNA log and trace files, see the 
"Microsoft Host Integration Server Online Books."

When this problem occurs, you must stop and restart the SNA Server service.

CAUSE
=====

This problem occurs if the following conditions exist:

- An APPC mode has been configured with an automatic activation limit, and an
  explicit partnership has been defined.

- An invoking APPC transaction program issues an MC_ALLOCATE request by using
  the FQPLU_NAME (fully-qualified partner LU name) field instead of the
  PLU_ALIAS (partner LU alias) field. However the string that the transaction
  program specifies in the FQPLU_NAME field actually represents the partner LU
  alias instead of the fully-qualified partner LU name.

When the APPC transaction program issues an MC_ALLOCATE request under these
conditions, the SNA Server service enters an internal loop. This looping causes
the service to generate the symptoms that are listed in the "Symptoms" section
of this article.

RESOLUTION
==========

To resolve this problem, correct the APPC transaction program by using one of
the following methods:

- Change the invoking APPC transaction program so that it uses the PLU_ALIAS
  field of the MC_ALLOCATE instead of the FQPLU_NAME field.

- Change the invoking APPC transaction program so that it specifies a
  fully-qualified partner LU name in the FQPLU_NAME field instead of specifying
  a partner LU alias.

Additional query words: his2000 spin tp

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Keywords          : kbenv kbtool 
Technology        : kbAudDeveloper kbHostIntegServ2000
Version           : :
Issue type        : kbprb

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