Problem: CUPS re-writing printers.conf

[Timothy Murphy]

I am trying to print the CUPS Print Test Page from my laptop
on a printer attached to another machine on my home LAN.
But whenever I do this CUPS adds the line
"AuthInfoRequired username,password" to /etc/cups/printers.conf
on my laptop.
The result is that the job is rejected;
I read in /var/log/cups/error_log on the laptop:
--------------------------------
D [01/Aug/2009:03:11:08 +0100] [Job 24] Set job-printer-state-message to 
"Print file was not accepted (The printer or class is not shared!)!", 
current level=ERROR
D [01/Aug/2009:03:11:08 +0100] [Job 24] WWW-Authenticate=""
D [01/Aug/2009:03:11:08 +0100] [Job 24] 
	ATTR: auth-info-required=username,password
D [01/Aug/2009:03:11:08 +0100] [Job 24]
D [01/Aug/2009:03:11:08 +0100] [Job 24] STATE: none
D [01/Aug/2009:03:11:08 +0100] [Job 24] Backend returned status 2 
(authentication required)
D [01/Aug/2009:03:11:08 +0100] [Job 24] Job held for authentication.
--------------------------------

If I try to comment out the line in printers.conf
my comment character "# " is removed.

I googled for "CUPS auth-info-required=username,password"
and it seems that this has been a CUPS problem for some time,
although there do not seem any very recent reports.

I am running cups-1.4-0.rc1.10.fc11.i586 on both machines,
under Fedora-11.

Any elucidation of this strange event gratefully received.




-- 
Timothy Murphy  
e-mail: gayleard /at/ eircom.net
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland