Stop the User Name Server using the mqsistop command.
Enter the following command to delete the User Name Server:
mqsideleteusernameserver
On completion of this task, you have:
Stopped the Windows service that
runs the User Name Server.
Deleted the queue associated with the User Name Server on
the local queue manager.
Removed the record for the component in the broker registry. It is therefore
removed from the list of components displayed by issuing the mqsilist command.