There is another system which is included on linux by default which directly conflicts with port numbers we use:

    • 50001
    • 50002
    • 50011

    If a site is unable to start their supervisor, they may need to disable the hplip service, or they can change their supervisor port number. However if they do this, every single client and worker will also need to reflect these settings (for example):

    Supervisor qb.conf

    supervisor_port = 10001
    supervisor_sub_port = 10002

    Worker qb.conf

    worker_port = 10011
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