On Mon, Sep 08, 2025 at 09:29:27PM -0400, Hendrik Boom wrote:
> On Tue, Sep 09, 2025 at 11:03:23AM +1000, Tom via Dng wrote:
> > On 9/9/2025 10:52, Hendrik Boom wrote:
> > > A few months ago I stppped being albe to print on my Brother laser printer.
> > > In today's atteopt I successfuly used qpdfview to show me a pdf file,
> > > and then asked qpdfview to send it to the printer.
> > >
> > > After a while.a message appeared at the bottom right of the laptop screen:
> > >
> > > System Config Printer
> > > Nor connected?
> > > Printer
> > > 'Brother_HL-3170SDW]_
> > > may not be connected.
> > >
> > > This is the message I've been getting for the past few months,
> > > A few months ago, when it worked, instead a light on the printer
> > > would start to flash, indicating it was receiving data.
> > > Eventually printed pages would emerge.
> > >
> > > Presumably there is now difficulty reaching the networked printer.
> > >
> > > The printer itself is able to print test pages when operated from
> > > its own front panel.
> > > It reports its IP number of the LAN as being 192.168.1.4, obtained
> > > by DHCP.
> > >
> > > Other devices on the LAN are accessile from my laptop.
> > > Presumably my laptop is now unaware of the printer's IP number,
> > > Although it worked fine a few months ago.
> > >
> > > But ping on the laptop can reach the printer:
> > >
> > > root@midwinter:~# ping 192.168.1.4
> > > PING 192.168.1.4 (192.168.1.4) 56(84) bytes of data.
> > > 64 bytes from 192.168.1.4: icmp_seq=1 ttl=255 time=32.1 ms
> > > 64 bytes from 192.168.1.4: icmp_seq=2 ttl=255 time=16.3 ms
> > > 64 bytes from 192.168.1.4: icmp_seq=3 ttl=255 time=14.6 ms
> > > 64 bytes from 192.168.1.4: icmp_seq=4 ttl=255 time=16.5 ms
> > > ^C
> > > --- 192.168.1.4 ping statistics ---
> > > 4 packets transmitted, 4 received, 0% packet loss, time 3005ms
> > > rtt min/avg/max/mdev = 14.556/19.871/32.108/7.105 ms
> > > root@midwinter:~#
> > >
> > > So thereis indeed *something* at the IP address the printer
> > > claims belongs to it.
> > >
> > > Presumably something has changed.
> > >
> > > I use CUPS.
> > > CUPS does appear to be installed(so aptitude informs me),
> > > and it all seemed to work a few months ago..
> > >
> > > But now firefox cannot connect at http://localhost:631
> > >
> > > Isn't that the normal way to configure printers on CUPS?
> > > Or has something changed?
> > >
> > > I'm inclined to suspect that somthing has gone wrong
> > > with CUPS. Of cuorse I could be completely wrong and need
> > > to look elsewhere.
> > >
> > > -- hendrik
> >
> > Do you still have the cups-daemon package installed?
>
> Interesting.
>
> aptitude (interactive) appears to show a cups-daemon, but
> its status it i A
>
> i A cups-daemon ...
>
> So smething is likely wrong with it.
No.... it seems the A may mean automatically installed.
I'll proceed to to the othe checks you described.
--hendrik
> The same I A is present for cups-filters, cups-fiters-core-drivers,
> and cups-filters-core-drivers, and a lot of other cups- packages.
>
> -- hendrik
>
> > On my system
> > that is providing /usr/sbin/cupsd and /etc/init.d/cups.
> > /usr/sbin/cupsd is serving port 631 here.
> >
> > # lsof -i :631
> > COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
> > cupsd 1818 root 5u IPv6 34498 0t0 TCP localhost:ipp (LISTEN)
> > cupsd 1818 root 6u IPv4 34499 0t0 TCP localhost:ipp (LISTEN)
> >
> > Check if the cups service is running. Do you have https-only (port
> > 443) enabled for localhost:631?
> >
> > I connect successfully here to a brother laser printer using AirPrint
> > (bonjour/avahi/zeroconf) from a macos system but I guess IPP from
> > linux should also work. Check the printer on-device setup menu to see
> > if any networking/printing protocols have been disabled? Nmap can
> > also be useful here to check remote services.
> >
> > Tom
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