On 9/9/2025 13:51, 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? On my system
>> that is providing /usr/sbin/cupsd and /etc/init.d/cups.
>> /usr/sbin/cupsd is serving port 631 here.
>>
>
> It appears to exist, but is not serving port 631.
>
> root@midwinter:~# lsof -i :631
> root@midwinter:~# which cupsd
> /usr/sbin/cupsd
> root@midwinter:~#
>
>
> It looks as if nothing is listening to :631
> Maybe an init problem? Try to start the service.
>
> root@midwinter:~# /etc/init.d/cups start
> Starting Common Unix Printing System: cupsd.
> root@midwinter:~# lsof -i :631
> root@midwinter:~# ps -Al | grep cups
> 0 S 0 1517 1 0 80 0 - 6510 - ? 00:00:07 cups-browsed
> 4 S 0 1533 1 0 80 0 - 4142 SyS_ep ? 00:00:02 cupsd
>
> Still no one listening to :631, even though cupsd is running.
>
>> # 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?
>
> How would I do that? Or how would I have done that?
>
> -- hendrik
Look in /etc/cups/cupsd.conf. It's documented in cupsd.conf(5) man page.
example:
---8<---
# Only listen for connections from the local machine.
Listen localhost:631
Listen /var/run/cups/cups.sock
---8<---
Check all relevant 'Listen' and 'Port' directives.
cupsd.conf man page also says:
---8<---
Encryption IfRequested
Encryption Never
Encryption Required
Specifies the level of encryption that is required for a
particular location. The default value is "IfRequested".
---8<---
so I guess it should default to http and https if you don't change that
config.
Tom
::
Re: [DNG] printer connection stoppe…
