Let's say the IBM MQ error log has the following. In this example, when the foo.jar application attempted to connect to the IBM MQ queue manager named MANAGER01, the foo.jar application did not provide a username and password.

01/14/2022 05:13:47 PM - Process(31843.104651) User(mqm) Program(amqzlaa0)
                    Host(mq.example.com) Installation(Installation1)
                    VRMF(9.1.0.5) QMgr(MANAGER01)
                    Time(2022-01-14T23:13:47.100Z)
                    CommentInsert1(foo app)

AMQ5540E: Application 'foo app' did not supply a user ID and password

As one possible example, let's say the application is a Java application that is using com.ibm.mq.allclient.jar to make the connection to IBM MQ. Notice in this example that a username (john.doe) and password (itsasecret) is included. If the username or password are not included, this can cause "AMQ5540E Application did not supply a user ID and password" to be captured in the IBM MQ error log.

cf.setStringProperty( WMQConstants.WMQ_HOST_NAME, "node1.example.com");
cf.setIntProperty(    WMQConstants.WMQ_PORT, 1414);
cf.setStringProperty( WMQConstants.WMQ_CHANNEL, "channel01");
cf.setIntProperty(    WMQConstants.WMQ_CONNECTION_MODE, WMQConstants.WMQ_CM_CLIENT);
cf.setStringProperty( WMQConstants.WMQ_QUEUE_MANAGER, "MANAGER01");
cf.setBooleanProperty(WMQConstants.USER_AUTHENTICATION_MQCSP, true);
cf.setStringProperty( WMQConstants.USERID, "john.doe");
cf.setStringProperty( WMQConstants.USERID, "itsasecret");

It is noteworthy that in a Java application using com.ibm.mq.allclient.jar, the WMQConstants.WMQ_APPLICATIONNAME property can be used to define the name of the application.

cf.setStringProperty(WMQConstants.WMQ_APPLICATIONNAME, "foo app");