mysterious jobs

Helge Blischke h.blischke at acm.org
Sat May 9 02:29:05 PDT 2009


Jim McCloskey wrote:

> In desperation, I'm resending a query that I sent originally last month
> but which elicited no response. I set up a new printer (Dell 2330dn) under
> CUPS 1.3.8 running under Debian linux. I used the PPD file that came on
> the accompanying CD from Dell. The problem I'm having is that every minute
> or so a print-job is sent to the new printer which results in the printing
> of a page with these lines at the top:
> 
> ----------------------------------------------------------------------
> POST / HTTP/1.1
> Content-Length: 263
> Content-Type: application/ipp
> Host: xxx.xxx.xxx.xx    %%% (the printer's IP address)
> User-Agent: CUPS/1.3.8
> Expect: 100-Continue
> 
> ----------------------------------------------------------------------
> 
> followed by a single line of characters which are mostly unreadable and
> which spill off the end of the physical line in a manner reminiscent of
> the stair-case effect. These are hard to read (because many characters are
> over-printed) but I think that they are mostly responses to requests for
> printer-attributes.  It seems that the pages being printed reflect a
> record of exchanges between the cups daemon and the printer, but none of
> us can figure out why these records are being printed or how to stop the
> printing.
> 
> This seems to be the same problem that is reported in the thread that
> begins here:
> 
>   http://www.mail-archive.com/mhvlug@mhvlug.org/msg01007.html
> 
> but which sadly seems to end without resolution. I contacted the original
> poster in that thread and was told that they simpled blocked all
> communication between the CUPS server and the printer to stop the
> printing.
> 
> I would be extraordinarily grateful for any help at all that anyone might
> be able to offer in resolving this problem.
> 
> Thank you for all of your work,
> 
> Jim

Could it be that the printer misinterprets HTTP 1.1?
The Linux stuff downloaded from Dell's support page only tells about using
the socket backend (with default port 9100) for use with CUPS.

Helge






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