[sane-devel] SCX-3405W scans with usb but not when shared from Linux Mint

[Olaf Meeuwissen]

Hi,

I only see Ralph's part of the conversation on the list ...

That notwithstanding, you may want to take not of

  https://gitlab.com/sane-project/backends/-/issues/275
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=958074

Not sure Mint 19.2 uses the same set up as Debian Buster but since
they're related, I thought I'd mention it.

Ralph Little writes:

> Hi,
>
> On 2020-05-19 9:27 a.m., vicki at thepenguin.org wrote:
>>
>> OK, let's try to narrow this down a bit.
>> I have to ask the obvious: does the main machine have a firewall installed?
>>
>> Next, let's make sure that the saned service is running properly.
>> On the main machine, saned listens on port 6566.
>> If you try:
>>
>> netstat -an | grep 6566
>>
>> ... do you see this or something similar?
>>
>>> tcp6 0 0 :::6566 :::* LISTEN
>> I see exactly that when I run netstat. That makes me wonder. I have
>> disabled IPv6 on the interface that connects to my local network on
>> both devices (due to an unrelated issue). Maybe there is somewhere
>> that I should specify that I want to use IPv4?
>> The output from the scanimage command is:
>>
>> home-E7250:~$ SANE_DEBUG_NET=50 scanimage -L
>> [sanei_debug] Setting debug level of net to 50.
>> [net] sane_init: authorize != null, version_code != null
>> [net] sane_init: SANE net backend version 1.0.14 (AF-indep+IPv6) from sane-backends 1.0.27
>> [net] sane_init: Client has little endian byte order
>> [net] sane_init: searching for config file
>> [net] sane_init: done reading config
>> [net] sane_init: evaluating environment variable SANE_NET_HOSTS
>> [net] sane_init: evaluating environment variable SANE_NET_TIMEOUT
>> [net] sane_init: done
>> [net] sane_get_devices: local_only = 0
>> [net] sane_get_devices: finished (0 devices)
>> [net] net_avahi_browse_callback: CACHE_EXHAUSTED
>> [net] net_avahi_browse_callback: ALL_FOR_NOW
>>
>> No scanners were identified. If you were expecting something different,
>> check that the scanner is plugged in, turned on and detected by the
>> sane-find-scanner tool (if appropriate). Please read the documentation
>> which came with this software (README, FAQ, manpages).
>> [net] sane_exit: exiting
>> [net] net_avahi_cleanup: stopping thread
>> [net] net_avahi_cleanup: done
>> [net] sane_exit: finished.
>>
> Interesting.
> It is possible that saned is having permissions issues accessing the
> devices locally, and therefore not advertising them to your laptop, but
> let's not assume that yet.
>
> On my remote machine, I see:
>
> [net] connect_dev: trying to connect to 192.168.1.16
>
> ..but I don't see anything like that there.
>
> Could you give us a dump of your laptop's /etc/sane.d/net.conf?

Hope this helps,
--
Olaf Meeuwissen, LPIC-2            FSF Associate Member since 2004-01-27
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