If you have not already done so, start WebSphere MQ by following one of these procedures:
su mqm
strmqm bcg.queue.manager
runmqlsr -t tcp -p 9999 -m bcg.queue.manager &
strmqbrk -m bcg.queue.manager
strmqm bcg.queue.manager
runmqlsr -t tcp -p 9999 -m bcg.queue.manager
The Listener runs in this window; therefore, leave it open.
strmqbrk -m -bcg.queue.manager