IBM Support

IT27403: AMQ9213: A communications error for Unexpected flow

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APAR status

  • Closed as program error.

Error description

  • When using SHARECNV(0) on MQ server connection channels whilst
    transferring messages that are greater than 32304 bytes in size,
    client connections may experience MQRC_CONNECTION_BROKEN or
    MQRC_UNEXPECTED_ERROR channel disconnects and the following
    errors may be logged:
    
    AMQ9213: A communications error for Unexpected flow received
    during MQDISC call occurred.
    AMQ9208: Error on receive from host <host name>
    AMQ9504: A protocol error was detected for channel '<channel
    name>.
    AMQ6183: An internal IBM MQ error has occurred.
    AMQ9999: Channel '<channel name>' to host '<host name>' ended
    abnormally.
    
    An First Data Capture (FDC) report with the following
    characteristics may also be logged:
    
     Probe Id          :- DN138001
     Major Errorcode   :- rrcE_COMMUNICATIONS_ERROR
     Probe Type        :- MSGAMQ9213
     Probe Description :- AMQ9213: A communications error for
    Unexpected flow
      received during MQDISC call occurred.
    

Local fix

  • Alter the value of SHARECNV for the server-connection channel
    from 0 to 1 or higher (the default is 10).
    

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Multi-threaded Windows .NET MQ client applications using the MQ
    .NET client library and a server connection channel with
    SHARECNV(0) configured. Problems are observed when such channels
     receive messages greater than 32304 bytes in size.
    
    
    Platforms affected:
    Windows
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    A small timing window in the MQ .net client code can cause
    messages greater than 32304 bytes in size to be handled
    incorrectly in multi-threaded applications. This may cause MQ
    TSH packets to be corrupted resulting in channel disconnects and
    communication flow errors.
    

Problem conclusion

  • The MQ .NET client code has been corrected to resolve this
    problem.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v8.0       8.0.0.12
    v9.0 LTS   9.0.0.7
    v9.1 CD    9.1.3
    v9.1 LTS   9.1.0.3
    
    The latest available maintenance can be obtained from
    'WebSphere MQ Recommended Fixes'
    http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
    
    If the maintenance level is not yet available information on
    its planned availability can be found in 'WebSphere MQ
    Planned Maintenance Release Dates'
    http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
    ---------------------------------------------------------------
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT27403

  • Reported component name

    IBM MQ BASE MP

  • Reported component ID

    5724H7251

  • Reported release

    800

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2018-12-18

  • Closed date

    2019-04-24

  • Last modified date

    2019-04-24

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

Fix information

  • Fixed component name

    IBM MQ BASE MP

  • Fixed component ID

    5724H7251

Applicable component levels

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"8.0.0.0","Edition":"","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
24 April 2019