Novell LINUX ENTERPRISE SERVER 11 - ADMINISTRATION Administration Manual page 142

10.8.5 Defective Printouts without Error
Message
For the print system, the print job is completed when the CUPS back-end completes
the data transfer to the recipient (printer). If further processing on the recipient fails
(for example, if the printer is not able to print the printer-specific data) the print system
does not notice this. If the printer is not able to print the printer-specific data, select a
PPD file that is more suitable for the printer.
10.8.6 Disabled Queues
If the data transfer to the recipient fails entirely after several attempts, the CUPS back-
end, such as USB or socket, reports an error to the print system (to cupsd). The
back-end determines how many unsuccessful attempts are appropriate until the data
transfer is reported as impossible. As further attempts would be in vain, cupsd disables
printing for the respective queue. After eliminating the cause of the problem, the system
administrator must reenable printing with the command cupsenable.
10.8.7 CUPS Browsing: Deleting Print Jobs
If a CUPS network server broadcasts its queues to the client hosts via browsing and a
suitable local cupsd is active on the client hosts, the client cupsd accepts print jobs
from applications and forwards them to the cupsd on the server. When cupsd accepts
a print job, it is assigned a new job number. Therefore, the job number on the client
host is different from the job number on the server. As a print job is usually forwarded
immediately, it cannot be deleted with the job number on the client host This is because
the client cupsd regards the print job as completed as soon as it has been forwarded
to the server cupsd.
When it becomes desirable to delete the print job on the server, use a command such
as lpstat -h cups.example.com -o to determine the job number on the
server, provided the server has not already completed the print job (that is, sent it
completely to the printer). Using this job number, the print job on the server can be
deleted:
cancel -h cups.example.com queue-jobnnumber
128 Administration Guide