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

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 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