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IC70091: WHEN USING SHARECNV=0 ON WINDOWS, .NET CLIENT CONNECTIONS ARE LOCKED IN CLOSE-WAIT EVENTUALLY CONSUMING ALL AVAILABLE SOCKETS

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APAR status

  • Closed as program error.

Error description

  • A WebSphere MQ .NET client connecting to a queue manager over a
    non-multiplexed channel does not close the socket after
    disconnecting from the queue manager. As a result, sockets are
    locked in CLOSE_WAIT state which can eventually result in no
    sockets being available for making further connections.
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users of the WebSphere MQ .NET and XMS clients who use non-
    multiplexed (SHARECNV=0) channels to connect to queue managers.
    
    Platforms affected:
    Windows
    
    ****************************************************************
    PROBLEM SUMMARY:
    When a client makes a call to disconnect from the queue manager,
    it sends a MQDISC call to the queue manager. The queue manager
    acknowledges this and responds back to the client. Upon receipt
    of this response, the client must close the socket at its end to
    complete termination of the conversation. Since the client did
    not close the socket, all such sockets remained in CLOSE_WAIT
    state and therefore not being available for future connections.
    

Problem conclusion

  • The WebSphere MQ .NET client code has been modified to ensure
    that the client side closes the socket after disconnecting from
    the queue manager.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
                       v7.0
    Platform           Fix Pack 7.0.1.4
    --------           --------------------
    Windows            U200323
    
    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

    IC70091

  • Reported component name

    WMQ WINDOWS V7

  • Reported component ID

    5724H7220

  • Reported release

    701

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2010-07-21

  • Closed date

    2010-08-31

  • Last modified date

    2010-08-31

  • 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

    WMQ WINDOWS V7

  • Fixed component ID

    5724H7220

Applicable component levels

  • R701 PSY

       UP

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Document Information

Modified date:
31 August 2010