IT41710: CWSMQ0006E error and System.ArgumentNullException reported when attempting to connect to a version 9.2 or lower queue manager

APAR status

• Closed as program error.

Error description

• A managed .NET application gets error CWSMQ0006E and Exception
  System.ArgumentNullException when it attempts to connect to the
  queue manager.
  
  The following is the exception detail:
  
  MessageConsumerBackgroundService has encountered an unhandled
  exception. IBM.XMS.XMSException: CWSMQ0006E: An exception was
  received during the call to the method
  ConnectionFactory.CreateConnection:
  System.NullReferenceException: Object reference not set to an
  instance of an object.
     at IBM.WMQ.MQConnectOptions.set_ConnTag(Byte[] value) in
  D:\IBM\MQ\basedotnet\nmqi\MQConnectOptions.cs:line 300
     at IBM.WMQ.MQFAP.NmqiConnect(String name, NmqiConnectOptions
  pNmqiConnectOpts, MQConnectOptions cno, Hconn remoteParentHconn,
  Phconn pHconn, Int32& compCode, Int32& reason, ManagedHconn
  rcnHconn) in D:\basedotnet\MQFAP.prep.cs:line 2095
     at IBM.WMQ.MQFAP.NmqiConnect(String pQMgrName,
  NmqiConnectOptions pNmqiConnectOpts, MQConnectOptions
  pConnectOpts, Hconn parentHconn, Phconn pHconn, Int32&
  pCompCode, Int32& pReason) in D:\basedotnet\MQFAP.prep.cs:line
  1231
     at IBM.XMS.Client.WMQ.WmqConnection..ctor(NmqiEnvironment
  nmqiEnv, NmqiMQ nmqiMQ, XmsPropertyContext connectProps) in
  D:\IBM\MQ\xms\dotnetclient\src\code\ClientWMQ\WmqConnection.cs:l
  ine 180
     at
  IBM.XMS.Client.WMQ.Factories.WmqConnectionFactory.CreateV7Provid
  erConnection(XmsPropertyContext connectionProps) in
  D:\IBM\MQ\xms\dotnetclient\src\code\ClientWMQ\Factories\WmqConne
  ctionFactory.cs:line 1405.
  During execution of the specified method an exception was thrown
  by another component.
  See the linked exception for more information.
     at
  IBM.XMS.Client.WMQ.Factories.WmqConnectionFactory.CreateProvider
  Connection(XmsPropertyContext connectionProps) in
  D:\IBM\MQ\xms\dotnetclient\src\code\ClientWMQ\Factories\WmqConne
  ctionFactory.cs:line 850
     at
  IBM.XMS.Client.Impl.XmsConnectionFactoryImpl.CreateConnection(St
  ring userID, String password) in
  D:\IBM\MQ\xms\dotnetclient\src\code\ClientImpl\Admin\XmsConnecti
  onFactoryImpl.cs:line 239
     at
  IBM.XMS.Client.Impl.XmsConnectionFactoryImpl.CreateConnection()
  in
  D:\IBM\MQ\xms\dotnetclient\src\code\ClientImpl\Admin\XmsConnecti
  onFactoryImpl.cs:line 194
     at SimpleWMQSamples.SimpleConsumer.ReceiveMessages() in
  D:\IBM\MQ\xms\dotnetclient\src\samples\SampleProducer\SampleProd
  ucerCS.cs:line 185
     at SimpleWMQSamples.SimpleConsumer.Main(String[] args) in
  D:\IBM\MQ\xms\dotnetclient\src\samples\SampleProducer\SampleProd
  ucerCS.cs:line 114
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users using MQ managed .Net client to connect to a queue manager
  of version 9.2 or lower.
  
  
  Platforms affected:
  Windows, Linux on x86-64
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  A coding error caused one of the arguments to an internal method
  call to be null while assigning the values
  

Problem conclusion

• MQ Managed .Net code has been modified to send correct value to
  the argument of the method
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.3 LTS   9.3.0.20
  v9.4 LTS   9.4.0.0
  
  The latest available maintenance can be obtained from
  'IBM MQ Recommended Fixes'
  https://www.ibm.com/support/pages/recommended-fixes-ibm-mq
  
  If the maintenance level is not yet available information on
  its planned availability can be found in 'IBM MQ
  Planned Maintenance Release Dates'
  https://ibm.biz/mqplannedmaintenance
  
  ---------------------------------------------------------------
  

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

  MQ BASE V9.3

• Fixed component ID

  5724H7291

Applicable component levels