access to Canon i-Sensys MF645 scanner via network

Question

I'm sorry, I tried many things but without success, and could use some help. I have a Canon i-Sensys MF645Cx multifunction printer / scanner connected via my home LAN. Printing worked out-of-the-box, now I wanted to use the scanner.

I installed from the Canon webpage

https://www.canon-europe.com/support/consumer_products/products/fax__multifunctionals/laser/laserbase_mf_series/i-sensys-mf645cx.html?type=drivers&language=en&os=linux%20(64-bit)

• UFR II/UFRII LT Printer Driver for Linux V5.10 (printer is not shown on registration, I added the printer and its IP-address for "socket")
• CQue driver "deb"

I played around with ufw firewall rules e.g.

% sudo ufw status
Status: active

To                         Action      From
--                         ------      ----
8610/udp                   ALLOW       Anywhere                  
8612/udp                   ALLOW       Anywhere                  
8610/udp (v6)              ALLOW       Anywhere (v6)             
8612/udp (v6)              ALLOW       Anywhere (v6)

and tried to edit /etc/sane.d/pixma.conf, with either line added

bjnp://192.168.2.100
mfnp://192.168.2.100

but when I start xsane (e.g. with the mfnp line activated), I get

% xsane
[bjnp] udp_command: ERROR - no data received (timeout = 1000)
[bjnp] bjnp_init_device_structure: Cannot read mac address, skipping this scanner
[bjnp] udp_command: ERROR - no data received (timeout = 1000)
[bjnp] add_scanner: ERROR - Cannot read scanner make & model: bjnp://192.168.2.100:8612/timeout=1000

I also tried https://launchpad.net/~rolfbensch/+archive/ubuntu/sane-git

sudo add-apt-repository ppa:rolfbensch/sane-git
sudo apt-get update

but that didn't change anything.

I also added myself to the groups scanner and saned according to https://wiki.ubuntuusers.de/Scanner/#Hardware, without success.

Any ideas how I can get the the scanner working? Thanks a lot!

Answer 1

With some help I found the solution (Ubuntu 18.04): What I forgot was to upgrade after adding the external repository:

sudo add-apt-repository ppa:rolfbensch/sane-git
sudo apt-get update
sudo apt upgrade

This seems the be the decisive change. The firewall can actually be disabled:

% sudo ufw status
Status: inactive

No changes have to be made to config files in /etc/sane.d. (I cannot say whether installing the two Canon packages or the group membership is important since I didn't revert these steps.)

Then xsane starts and seems to works fine with the Canon i-Sensys MF645Cx.

The only strange thing was a flood of error messages when xsane started such as Cannot adopt OID in UCD-SNMP-MIB: .... I followed the advice on colord errors in /var/log/syslog in 18.10 and installed the package snmp-mibs-downloader using sudo synaptic (plus another package that was added as a dependency). Then the messages disappear.