Running IBM MQ in a Docker container and the client connecting to it was throwing repeated
Channel was blocked errors.
AMQ9777E: Channel was blocked [CommentInsert1(SYSTEM.DEF.SVRCONN), CommentInsert2(kafka-connect (192.168.48.8)), CommentInsert3(CLNTUSER(app)] AMQ9999E: Channel 'SYSTEM.DEF.SVRCONN' to host '192.168.48.8' ended abnormally. [CommentInsert1(SYSTEM.DEF.SVRCONN), CommentInsert2(1647), CommentInsert3(192.168.48.8)]
Ths container was part of a Docker Compose:
ibmmq: image: ibmcom/mq:126.96.36.199-r2 container_name: ibmmq ports: - "9443:9443" environment: LICENSE: "accept" MQ_ADMIN_PASSWORD: "Admin123" MQ_APP_PASSWORD: "Admin123" MQ_QMGR_NAME: "QM1"
Reading the MQ image documentation carefully I found this:
Two channels are created, one for administration, the other for normal messaging:
DEV.ADMIN.SVRCONN - configured to only allow the admin user to connect into it. A user and password must be supplied.
DEV.APP.SVRCONN - does not allow administrative users to connect. Password is optional unless you choose a password for app users.
Turned out I was using the wrong channel name (
SYSTEM.DEF.SVRCONN). Changing my client to use the correct one (
DEV.APP.SVRCONN) fixed the problem.
To list the channels available run on the IBM MQ container:
echo "DISPLAY CHSTATUS(*)" | runmqsc QM1