[CentOS] Do i have to open port 631 for LAN printing

Craig White craigwhite at azapple.com
Sun Mar 5 03:53:30 UTC 2006

On Sat, 2006-03-04 at 22:35 -0500, lnthai2002 at aim.com wrote:
> -----Original Message-----
> From: Craig White <craigwhite at azapple.com>
> To: CentOS mailing list <centos at centos.org>
> Sent: Sat, 04 Mar 2006 08:14:37 -0700
> Subject: Re: [CentOS] Do i have to open port 631 for LAN printing
>   On Sat, 2006-03-04 at 09:51 -0500, lnthai2002 at aim.com wrote:
> > Hi,
> > I have a Samsung printer(ML-2010) connect to my centos 4.2 machine by
> > usb. I want to share this printer with 3 windowsXP mchines in my LAN.
> > Although i have install driver for the printer on all machines, use
> > samba to share the printer, from the windows machine i still have an
> > error"access denied, can not connect to printer" or something 
> similar.
> > In Security Level, i have checked "trusted device: eth0, sit0" , is
> > port 631 automatically open? How do i know that my problem is not
> > caused by the blocked port? Hope anyone can help
> -------------------------------------------------------------------------
> ---------------------------------
> windows doesn't use cups port
> error message of 'access denied' doesn't necessarily mean that Windows
> users can't print to it (that's very confusing, I know) but that
> certainly means that the users can't "manage" the printer.
> in samba printer share, there is an option for 'printer admin' which if
> the user/group is appropriate, will allow the user/group to 'manage' the
> printer, which is generally where the 'access denied' message comes from
> in a samba shared printer when looking at the 'status' from Windows
> 'Printers & Faxes'
> Generally, I would expect the problem that you are having is that you
> are using 'client side' drivers and by default, cups (via samba) is
> offering a postscript printer.
> I don't know what the specifics of a Samsung ML-2010 are but it would
> seem that you have 2 options...
> 1 - set the printer up in windows as a postscript printer, preferably
> using the Adobe Postscript print driver and the ppd that was created by
> cups on the CentOS system when you created the printer (located
> in /etc/cups/ppd)
> or
> 2 - set the printer options within cups to allow 'raw' printing - which
> allows your samba shared non-postscript printer commands to pass through
> 'unmolested' to the printer (see /etc/cups/mime.types
> & /etc/cups/mime.convs)
> All of this is summarized in the official Samba 3 HowTo...
> http://samba.org/samba/docs/man/Samba-HOWTO-Collection/CUPS-printing.html
> and things are starting to gel at the new samba wiki
> http://wiki.samba.org
> for which printing support is here...
> http://wiki.samba.org/index.php/Samba_as_a_print_server
> and I mention the wiki because I was drafted and am the editor of the
> wiki ;-)
> -------------------------------------------------------------------------
> -----------------------------------------------
>   The samsung ML-2010 does not have a postscript driver, it used a 
> samsung language II driver that is available on windows and linux. I 
> have read the samba-HOWTO-Collection document and config the mime.type 
> and mine.conv to accept raw printjob. However, the instructions are 
> hard to understand
>     1. Edit /etc/cups/mime.types to uncomment the line near the end of 
> the file that has:
>        #application/octet-...
>    2. Do the same for the file /etc/cups/mime.convs.
>     3. Add a raw printer using the Web interface. Point your browser at 
> http://localhost:631. Enter Administration, add the printer following 
> the prompts. Do not install any drivers for it. Choose Raw. Choose 
> queue name Raw Queue.
>     4. In the smb.conf file [printers] section add use client driver = 
> Yes, and in the [global] section add printing = CUPS, plus printcap = 
>     5. Install the printer as if it is a local printer. i.e.: Printing 
> to LPT1:.(in my case /dev/usb/lp0) I did until this line
>     6. Edit the configuration under the Detail tab, create a local port 
> that points to the raw printer queue that you have configured above. 
> Example: \\server\raw_q. Here, the name raw_q is the name you gave the 
> print queue in the CUPS environment.
> The line number 6 is not clear, i dont know what application they are 
> talking about for the "Detail tab". How can i create a local port and 
> point to the raw printer queue?
> My goal is simple,
> 1/create a raw printer queue on CENTOS to accept any PREPARED print job 
> from any machine from the network
> 2/install a use samsung driver to prepare print job on CENTOS(same 
> machine where the printer is pluged into)
> 3/install and use windows samsung driver on windows machines to prepare 
> print jobs and sent them to the raw printer queue on CENTOS
>  Hope anyone can help
yeah - 6 is a bit confusing but you can actually make it simpler...

See if you can use the APW (add printer wizard) - network printer -
browse for the printer and see if the printer shows up in your
domain/workgroup and you can just select the printer which is the 'local
port'  If you can't locate the printer by browsing the network, it would
probably be a better network if you could fix the browsing problem but
the \\ip_address_of_centos_system\printer_share_name and the
printer_share_name would be the exact name of your printer as you set it
up in cups (hopefully without spaces).

If you have set mime.types and mime.convs to allow 'raw' printing then
that is your 'raw' print queue


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