CUPS, USB printers & "Permission Denied"

Anthony Agelastos iqgrande at
Mon Jun 26 04:16:15 UTC 2006

On Jun 25, 2006, at 9:05 PM, Micah wrote:

> Anthony Agelastos wrote:
>> Hello and thank you for the very quick reply.
>> On Jun 25, 2006, at 7:34 PM, albi wrote:
>>> On Sun, 25 Jun 2006 19:28:35 -0400
>>> "Anthony Agelastos" <iqgrande at> wrote:
>>>> I updated CUPS and I cannot print to my USB laser printer. The web
>>>> interface shows the following:
>>>> hp_LaserJet_1160Le (Default Printer) "Unable to open USB device
>>>> "usb:/dev/ulpt0": Permission denied"
>>>>     Description: Hewlett-Packard LaserJet 1160Le
>>>> Location: Den
>>>> Make and Model: HP LaserJet 1160 Foomatic/hpijs (recommended)
>>>> Printer State: stopped, accepting jobs, published.
>>>> Device URI: usb:/dev/ulpt0
>>> are the permissions on /dev/ulpt0 correct ?
>> I have no idea what it is supposed to be.
>> %ls -l /dev/ulpt0
>> crw-r--r--  1 root  operator    0,  68 Jun 25 19:01 /dev/ulpt0
>>> if the printer runs fine as root you know it's likely a
>>> permission-problem
>> What's the best way to run it as root? When I log into the CUPS  
>> web interface as root and try to print a test page, it gives me  
>> the message I posted above. If, as root, I try to print a  
>> Postscript file via lp, it does nothing.
>> Thank you all again for your  
>> assistance._______________________________________________
> I had the same problem. chown ulpt0 to group cups and add group  
> write. That will fix it. I added the following to /etc/devfs.rules  
> to make the fix permanent:
I did

chgrp cups /dev/ulpt0
chmod g+w /dev/ulpt0

> [system=10]
> add path 'unlpt*' mode 0660 group cups
> add path 'ulpt*' mode 0660 group cups
I did not have a /etc/devfs.rules file, so I copied /etc/defaults/ 
devfs.rules to /etc/devfs.rules and added what you suggested at the  
bottom of it.

> Don't forget to restart devfs.
When I do
/etc/rc.d/devfs restart
it seems like nothing happens. So, I rebooted my machine and the  
group was back to operator. What am I doing wrong? Thank you so much  
for your assistance with this.

> HTH,
> Micah

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