IBM Support

IJ01244: MQ XMS client application connecting to SIB throws CWSIT0006E exception is max connections limit reached

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APAR status

  • Closed as program error.

Error description

  • If the number of connections to WAS Service Integration Bus
    reach maximum limit i.e 65536, XMS.NET Client application throws
    an unhandled CWSIT0006E exception which causes the application
    to abruptly end.Following is the exception
    
    IBM.XMS.XMSException - EXCEPTION_RECEIVED_CWSIA0241
    EXCEPTION_RECEIVED_CWSIA0241.explanation
    EXCEPTION_RECEIVED_CWSIA0241.useraction
       at IBM.XMS.Impl.ConnectionFactory.CreateConnection(String
    userName,
         String password)
       at IBM.XMS.Impl.ConnectionFactory.CreateConnection()
       at IBM.Module.ISH.Interface.XmsClient.connect()
       at IBM.Module.ISH.Interface.XmsClient.read()
       at IBM.Module.ISH.Interface.IshXmsProxy.read(Param
    queueCorrelationInfo, Param queueInfo)
    22.08.2017 12:31:07 - ERROR - LinkedException (XMSException):
    IBM.XMS.Core.SIResourceException - CWSIT0006E: It is not
    possible to
    connect to bus ISH.MQClientLinkProxy.Bus because the following
    bootstrap
    servers could not be contacted
    192.168.170.18:7276:BootstrapBasicMessaging and the following
    bootstrap
    servers returned an error condition . See previous messages for
    the
    reason for each bootstrap server failure.
    The client cannot connect to the bus. This situation may be due
    to
    configuration problems, network problems or it may be that none
    of the
    required bootstrap servers or messaging engines are currently
    available.
    Ensure that the network is working correctly and that the
    required
    bootstrap servers and messaging engines are available.
    

Local fix

  • Create one connection and use the same for any subsequent
    operations.
    

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    XMS.NET applications creating 65536 connections to WAS Service
    Integration Bus
    
    
    Platforms affected:
    Windows
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    If a XMS .NET application creates 65536 connections to WAS
    Service Integration Bus an unhandled exception is thrown by
    XMS.NET and the only way to recover was to re-start the
    application.
    

Problem conclusion

  • If the number of connections to WAS Service Integration Bus
    reach the maximum limit i.e 65536, XMS.NET should throw an
    exception which can be handled by the client application.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v8.0       8.0.0.9
    v9.0 LTS   9.0.0.4
    
    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

    IJ01244

  • Reported component name

    IBM MQ XMS V 8.

  • Reported component ID

    5724H7257

  • Reported release

    800

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2017-11-02

  • Closed date

    2018-03-29

  • Last modified date

    2018-04-10

  • 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 XMS V 8.

  • Fixed component ID

    5724H7257

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","Edition":"","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
10 April 2018