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Print queue problem: could not talk to print service at <node>

2007-12-25 11:49:00

Problem restatement:

---------------------

A user printed a file once, but the file continued to come out of their

printer, consuming much toner and a small forest. Trying to cancel the

print job with `cancel' yielded (after a 30 second delay):

    could not talk to print service at biocomp

Solution:

---------------------

# lpshut

# rm -r /var/spool/lp/tmp /var/spool/lp/temp /var/spool/lp/requests

# /usr/lib/lpsched

Starting lpsched recreated those directories I deleted.

I'm still getting the error message (and 30 second delay):

    could not talk to print service at biocomp

with cancel and lpq, but this may be a seperate problem. 'biocomp' is

the name of the UNIX box on which the printer is queued (same box as I

am executing cancel/lpq on). If anyone has any ideas, send 'em my way.

Cause of the problem:

---------------------

Most likely caused by a network hangup, which lasted longer than

the printer timeout. Here's how it should work. The spooler sends the

the print job to the printer, which gets broken up into tcp packets. The

printer accepts these packets as it can, handshaking with the server.

If there is REALLY slow network response (as in a network storm), the

server doesn't get the response in time, assumes the printer didn't

get the file, and resends it. The printer itself prints the original,

and the retransmission of it. Things can get pretty confused, and

the spooler can end up sending endless copies of part of or a whole file.

Thanks much to respondants!


--
Jim Winkle, UNIX System Administrator, UW-Madison, DoIT. Contact info:

BioComp: help@biocomp.doit.wisc.edu http://www-biocomp.doit.wisc.edu/
Other: jwinkle@doit.wisc.edu http://jwinkle.doit.wisc.edu/

Or use 264-HELP for help with services, 262-9507 to reach me directly.
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