the attempt to acquire an I/O channel for the debugger failed

    Facility: DEBUG, VMS Debugger

    Explanation: A bad status was returned from a $ASSIGN type of
    call. This message should be issued in the $DBG_INFO context.

    User Action: The debugger needs to acquire I/O channels to do
    I/O. In this case the debugger failed to acquire such a channel.
    Check your process quotas.