Unfortunately, still no joy… 
cris@PolariSuse:~> sudo systemctl stop SuSEfirewall2
root's password:
cris@PolariSuse:~> sudo systemctl status SuSEfirewall2
● SuSEfirewall2.service - SuSEfirewall2 phase 2
Loaded: loaded (/usr/lib/systemd/system/SuSEfirewall2.service; enabled; vendor preset: disabled)
Active: inactive (dead) since ven 2015-12-04 23:14:24 CET; 6s ago
Process: 18600 ExecStop=/usr/sbin/SuSEfirewall2 systemd_stop (code=exited, status=0/SUCCESS)
Process: 1548 ExecStart=/usr/sbin/SuSEfirewall2 boot_setup (code=exited, status=0/SUCCESS)
Main PID: 1548 (code=exited, status=0/SUCCESS)
dic 04 15:11:17 PolariSuse systemd[1]: Starting SuSEfirewall2 phase 2...
dic 04 15:11:17 PolariSuse SuSEfirewall2[1592]: Setting up rules from /etc/sysconfig/SuSEfirewall2 ...
dic 04 15:11:18 PolariSuse SuSEfirewall2[2186]: Firewall rules successfully set
dic 04 15:11:18 PolariSuse systemd[1]: Started SuSEfirewall2 phase 2.
dic 04 23:14:24 PolariSuse systemd[1]: Stopping SuSEfirewall2 phase 2...
dic 04 23:14:24 PolariSuse systemd[1]: Stopped SuSEfirewall2 phase 2.
cris@PolariSuse:~> sudo sane-find-scanner
# sane-find-scanner will now attempt to detect your scanner. If the
# result is different from what you expected, first make sure your
# scanner is powered up and properly connected to your computer.
# No SCSI scanners found. If you expected something different, make sure that
# you have loaded a kernel SCSI driver for your SCSI adapter.
found USB scanner (vendor=0x0ca6 [CASTLES], product=0x0010 [EZ100PU Smart Card Reader]) at libusb:003:004
# Your USB scanner was (probably) detected. It may or may not be supported by
# SANE. Try scanimage -L and read the backend's manpage.
# Not checking for parallel port scanners.
# Most Scanners connected to the parallel port or other proprietary ports
# can't be detected by this program.
cris@PolariSuse:~> scanimage -L
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).
Cris