> On the server:
> 
> SANE_DEBUG_HPLIP=255 saned -d128 > saned.log 2>&1
> 
> on the client:
> 
> SANE_DEBUG_NET=255 scanimage --help > scanimage.log 2>&1
> 
> You might need to give scanimage the device:
> 
> --device=net:10.2.1.70:hpaio:/usb/Officejet_J5700_series?serial=CN879CV07G0
> 4TC

Thanks for your work.

I attach the logs. (without --device option and with it) 
[sanei_debug] Setting debug level of net to 255.
[net] sane_init: authorize != null, version_code != null
[net] sane_init: SANE net backend version 1.0.14 (AF-indep+IPv6) from sane-backends 1.0.22
[net] sane_init: Client has little endian byte order
[net] sane_init: searching for config file
[net] sane_init: trying to add X.X.X.70
[net] add_device: adding backend X.X.X.70
[net] add_device: backend X.X.X.70 added
[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] connect_dev: trying to connect to X.X.X.70
[net] net_avahi_browse_callback: NEW: service 'saned' of type '_sane-port._tcp' in domain 'local'
[net] connect_dev: [0] connection succeeded (IPv4)
[net] connect_dev: sanei_w_init
[net] net_avahi_browse_callback: NEW: service 'saned #2' of type '_sane-port._tcp' in domain 'local'
[net] net_avahi_browse_callback: CACHE_EXHAUSTED
[net] connect_dev: net_init (user=dsutil, local version=1.0.3)
[net] net_avahi_browse_callback: ALL_FOR_NOW
[net] net_avahi_resolve_callback: service 'saned' of type '_sane-port._tcp' in domain 'local':
[net] 	yoguisu2.local:6566 (fe80::1aa9:5ff:fe18:82b3)
	TXT="protovers=1000003"
	cookie is 0
	is_local: 0
	our_own: 0
	wide_area: 0
	multicast: 1
	cached: 1
[net] add_device: adding backend yoguisu2.local
[net] connect_dev: freeing init reply (status=Success, remote version=1.0.3)
[net] connect_dev: done
[net] sane_get_devices: got X.X.X.70:hpaio:/usb/Officejet_J5700_series?serial=CN879CV07G04TC
[net] sane_get_devices: finished (1 devices)
[net] sane_open("X.X.X.70:hpaio:/usb/Officejet_J5700_series?serial=CN879CV07G04TC")
[net] sane_open: host = X.X.X.70, device = hpaio:/usb/Officejet_J5700_series?serial=CN879CV07G04TC
[net] sane_open: device found in list
[net] sane_open: net_open
[net] sane_open: getting option descriptors
[net] fetch_options: 0x75df90
[net] fetch_options: get_option_descriptors
[net] fetch_options: creating 17 local option descriptors
[net] fetch_options: copying 17 option descriptors
[net] fetch_options: 17 options fetched
[net] sane_open: success
[net] sane_get_option_descriptor: option 0
[net] sane_control_option: option 0, action 0
[net] sane_control_option: remote control option
[net] sane_control_option: remote done (Success, info 0)
[net] sane_control_option: done (Success, info 0)
[net] sane_get_option_descriptor: option 0
[net] sane_control_option: option 0, action 0
[net] sane_control_option: remote control option
[net] sane_control_option: remote done (Success, info 0)
[net] sane_control_option: done (Success, info 0)
[net] sane_get_option_descriptor: option 1
[net] sane_get_option_descriptor: option 2
[net] sane_get_option_descriptor: option 3
[net] sane_get_option_descriptor: option 4
[net] sane_get_option_descriptor: option 5
[net] sane_get_option_descriptor: option 6
[net] sane_get_option_descriptor: option 7
[net] sane_get_option_descriptor: option 8
[net] sane_get_option_descriptor: option 9
[net] sane_get_option_descriptor: option 10
[net] sane_get_option_descriptor: option 11
[net] sane_get_option_descriptor: option 12
[net] sane_get_option_descriptor: option 13
[net] sane_get_option_descriptor: option 14
[net] sane_get_option_descriptor: option 15
[net] sane_get_option_descriptor: option 16
[net] sane_control_option: option 15, action 0
[net] sane_control_option: remote control option
[net] sane_control_option: remote done (Success, info 0)
[net] sane_control_option: done (Success, info 0)
[net] sane_control_option: option 13, action 0
[net] sane_control_option: remote control option
[net] sane_control_option: remote done (Success, info 0)
[net] sane_control_option: done (Success, info 0)
[net] sane_control_option: option 16, action 0
[net] sane_control_option: remote control option
[net] sane_control_option: remote done (Success, info 0)
[net] sane_control_option: done (Success, info 0)
[net] sane_control_option: option 14, action 0
[net] sane_control_option: remote control option
[net] sane_control_option: remote done (Success, info 0)
[net] sane_control_option: done (Success, info 0)
[net] sane_control_option: option 13, action 0
[net] sane_control_option: remote control option
[net] sane_control_option: remote done (Success, info 0)
[net] sane_control_option: done (Success, info 0)
[net] sane_get_option_descriptor: option 15
[net] sane_control_option: option 15, action 1
[net] sane_control_option: remote control option
[net] sane_control_option: remote done (Success, info 4)
[net] sane_control_option: done (Success, info 4)
[net] sane_control_option: option 14, action 0
[net] sane_control_option: remote control option
[net] sane_control_option: remote done (Success, info 0)
[net] sane_control_option: done (Success, info 0)
[net] sane_get_option_descriptor: option 16
[net] sane_control_option: option 16, action 1
[net] sane_control_option: remote control option
[net] sane_control_option: remote done (Success, info 4)
[net] sane_control_option: done (Success, info 4)
[net] sane_get_option_descriptor: option 1
[net] sane_get_option_descriptor: option 2
[net] sane_control_option: option 2, action 0
[net] sane_control_option: remote control option
[net] sane_control_option: remote done (Success, info 0)
[net] sane_control_option: done (Success, info 0)
[net] sane_get_option_descriptor: option 3
[net] sane_control_option: option 3, action 0
[net] sane_control_option: remote control option
[net] sane_control_option: remote done (Success, info 0)
[net] sane_control_option: done (Success, info 0)
[net] sane_get_option_descriptor: option 4
[net] sane_get_option_descriptor: option 5
[net] sane_get_option_descriptor: option 6
[net] sane_control_option: option 6, action 0
[net] sane_control_option: remote control option
[net] sane_control_option: remote done (Success, info 0)
[net] sane_control_option: done (Success, info 0)
[net] sane_get_option_descriptor: option 7
[net] sane_control_option: option 7, action 0
[net] sane_control_option: remote control option
[net] sane_control_option: remote done (Success, info 0)
[net] sane_control_option: done (Success, info 0)
[net] sane_get_option_descriptor: option 8
[net] sane_control_option: option 8, action 0
[net] sane_control_option: remote control option
[net] sane_control_option: remote done (Success, info 0)
[net] sane_control_option: done (Success, info 0)
[net] sane_get_option_descriptor: option 9
[net] sane_control_option: option 9, action 0
[net] sane_control_option: remote control option
[net] sane_control_option: remote done (Success, info 0)
[net] sane_control_option: done (Success, info 0)
[net] sane_get_option_descriptor: option 10
[net] sane_get_option_descriptor: option 11
[net] sane_get_option_descriptor: option 12
[net] sane_control_option: option 12, action 0
[net] sane_control_option: remote control option
[net] sane_control_option: remote done (Success, info 0)
[net] sane_control_option: done (Success, info 0)
[net] sane_control_option: option 13, action 0
[net] sane_control_option: remote control option
[net] sane_control_option: remote done (Success, info 0)
[net] sane_control_option: done (Success, info 0)
[net] sane_control_option: option 14, action 0
[net] sane_control_option: remote control option
[net] sane_control_option: remote done (Success, info 0)
[net] sane_control_option: done (Success, info 0)
[net] sane_control_option: option 15, action 0
[net] sane_control_option: remote control option
[net] sane_control_option: remote done (Success, info 0)
[net] sane_control_option: done (Success, info 0)
[net] sane_control_option: option 16, action 0
[net] sane_control_option: remote control option
[net] sane_control_option: remote done (Success, info 0)
[net] sane_control_option: done (Success, info 0)
[net] sane_get_devices: local_only = 0
[net] sane_get_devices: freeing devlist
[net] sane_get_devices: got X.X.X.70:hpaio:/usb/Officejet_J5700_series?serial=CN879CV07G04TC
[net] sane_get_devices: finished (1 devices)
[net] sane_close: handle 0x75df90
[net] sane_close: removing cached option descriptors
[net] sane_close: removing local option descriptors
[net] sane_close: net_close
[net] sane_close: done
[net] sane_exit: exiting
[net] net_avahi_cleanup: stopping thread
[net] add_device: error while getting address of host yoguisu2.local: Name or service not known
[net] net_avahi_resolve_callback: couldn't add backend with name yoguisu2.local
[net] add_device: adding backend "protovers=1000003"
[net] add_device: error while getting address of host "protovers=1000003": Name or service not known
[net] net_avahi_resolve_callback: couldn't add backend with IP address "protovers=1000003" either
[net] net_avahi_resolve_callback: service 'saned #2' of type '_sane-port._tcp' in domain 'local':
[net] 	yoguisu.local:6566 (fe80::21f:d0ff:fe9e:cbc5)
	TXT="protovers=1000003"
	cookie is 0
	is_local: 1
	our_own: 0
	wide_area: 0
	multicast: 1
	cached: 1
[net] add_device: adding backend yoguisu.local
[net] add_device: error while getting address of host yoguisu.local: Name or service not known
[net] net_avahi_resolve_callback: couldn't add backend with name yoguisu.local
[net] add_device: adding backend "protovers=1000003"
[net] add_device: error while getting address of host "protovers=1000003": Name or service not known
[net] net_avahi_resolve_callback: couldn't add backend with IP address "protovers=1000003" either
[net] net_avahi_cleanup: done
[net] sane_exit: closing dev 0x71e200, ctl=6
[net] sane_exit: finished.
Usage: scanimage [OPTION]...

Start image acquisition on a scanner device and write image data to
standard output.

Parameters are separated by a blank from single-character options (e.g.
-d epson) and by a "=" from multi-character options (e.g. --device-name=epson).
-d, --device-name=DEVICE   use a given scanner device (e.g. hp:/dev/scanner)
    --format=pnm|tiff      file format of output file
-i, --icc-profile=PROFILE  include this ICC profile into TIFF file
-L, --list-devices         show available scanner devices
-f, --formatted-device-list=FORMAT similar to -L, but the FORMAT of the output
                           can be specified: %d (device name), %v (vendor),
                           %m (model), %t (type), %i (index number), and
                           %n (newline)
-b, --batch[=FORMAT]       working in batch mode, FORMAT is `out%d.pnm' or
                           `out%d.tif' by default depending on --format
    --batch-start=#        page number to start naming files with
    --batch-count=#        how many pages to scan in batch mode
    --batch-increment=#    increase page number in filename by #
    --batch-double         increment page number by two, same as
                           --batch-increment=2
    --batch-prompt         ask for pressing a key before scanning a page
    --accept-md5-only      only accept authorization requests using md5
-p, --progress             print progress messages
-n, --dont-scan            only set options, don't actually scan
-T, --test                 test backend thoroughly
-A, --all-options          list all available backend options
-h, --help                 display this help message and exit
-v, --verbose              give even more status messages
-B, --buffer-size=#        change input buffer size (in kB, default 32)
-V, --version              print version information

Options specific to device `net:X.X.X.70:hpaio:/usb/Officejet_J5700_series?serial=CN879CV07G04TC':
  Scan mode:
    --mode Lineart|Gray|Color [Color]
        Selects the scan mode (e.g., lineart, monochrome, or color).
    --resolution 75..2400dpi [75]
        Sets the resolution of the scanned image.
  Advanced:
    --contrast 0..100 [inactive]
        Controls the contrast of the acquired image.
    --compression None|JPEG [JPEG]
        Selects the scanner compression method for faster scans, possibly at
        the expense of image quality.
    --jpeg-quality 0..100 [10]
        Sets the scanner JPEG compression factor. Larger numbers mean better
        compression, and smaller numbers mean better image quality.
    --batch-scan[=(yes|no)] [no]
        Enables continuous scanning with automatic document feeder (ADF).
    --source Auto|Flatbed|ADF [Auto]
        Selects the scan source (such as a document-feeder).
  Geometry:
    --length-measurement Unknown|Approximate|Padded [Padded]
        Selects how the scanned image length is measured and reported, which
        is impossible to know in advance for scrollfed scans.
    -l 0..215.9mm [0]
        Top-left x position of scan area.
    -t 0..381mm [0]
        Top-left y position of scan area.
    -x 0..215.9mm [215.9]
        Width of scan-area.
    -y 0..381mm [381]
        Height of scan-area.

Type ``scanimage --help -d DEVICE'' to get list of all options for DEVICE.

List of available devices:
    net:X.X.X.70:hpaio:/usb/Officejet_J5700_series?serial=CN879CV07G04TC
[saned] main: starting debug mode (level 128)
[saned] read_config: searching for config file
[saned] read_config: done reading config
[saned] saned (AF-indep+IPv6) from sane-backends 1.0.21 starting up
[saned] do_bindings: trying to get port for service "sane-port" (getaddrinfo)
[saned] do_bindings: [1] socket () using IPv6
[saned] do_bindings: [1] setsockopt ()
[saned] do_bindings: [1] bind () to port 6566
[saned] do_bindings: [1] listen ()
[saned] do_bindings: [0] socket () using IPv4
[saned] do_bindings: [0] setsockopt ()
[saned] do_bindings: [0] bind () to port 6566
[saned] do_bindings: [0] bind failed: Address already in use
[saned] run_standalone: spawning Avahi process
[saned] run_standalone: waiting for control connection
[saned] saned_avahi_callback: AVAHI_CLIENT_S_RUNNING
[saned] saned_create_avahi_services: adding service 'saned'
[saned] saned_avahi_group_callback: service 'saned' successfully established
[saned] handle_connection: processing client connection
[saned] check_host: detected an IPv4-mapped address
[saned] check_host: access by remote host: ::ffff:X.X.X.68
[saned] check_host: remote host is not IN_LOOPBACK nor IN6_LOOPBACK
[saned] check_host: local hostname: yoguisu2
[saned] check_host: local hostname(s) (from DNS): yoguisu2
[saned] check_host: local hostname(s) (from DNS): (null)
[saned] check_host: local hostname(s) (from DNS): (null)
[saned] check_host: remote host doesn't have same addr as local
[saned] check_host: opening config file: /etc/hosts.equiv
[saned] check_host: can't open config file: /etc/hosts.equiv (No such file or directory)
[saned] check_host: opening config file: saned.conf
[saned] check_host: config file line: `# saned.conf'
[saned] check_host: config file line: `# Configuration for the saned daemon'
[saned] check_host: config file line: `'
[saned] check_host: config file line: `## Daemon options'
[saned] check_host: config file line: `# Port range for the data connection. Choose a range inside [1024 - 65535].'
[saned] check_host: config file line: `# Avoid specifying too large a range, for performance reasons.'
[saned] check_host: config file line: `#'
[saned] check_host: config file line: `# ONLY use this if your saned server is sitting behind a firewall. If your'
[saned] check_host: config file line: `# firewall is a Linux machine, we strongly recommend using the'
[saned] check_host: config file line: `# Netfilter nf_conntrack_sane connection tracking module instead.'
[saned] check_host: config file line: `#'
[saned] check_host: config file line: `# data_portrange = 10000 - 10100'
[saned] check_host: config file line: `'
[saned] check_host: config file line: `'
[saned] check_host: config file line: `## Access list'
[saned] check_host: config file line: `# A list of host names, IP addresses or IP subnets (CIDR notation) that'
[saned] check_host: config file line: `# are permitted to use local SANE devices. IPv6 addresses must be enclosed'
[saned] check_host: config file line: `# in brackets, and should always be specified in their compressed form.'
[saned] check_host: config file line: `#'
[saned] check_host: config file line: `# The hostname matching is not case-sensitive.'
[saned] check_host: config file line: `'
[saned] check_host: config file line: `#scan-client.somedomain.firm'
[saned] check_host: config file line: `#192.168.0.1'
[saned] check_host: config file line: `#192.168.0.1/29'
[saned] check_host: config file line: `#[2001:7a8:185e::42:12]'
[saned] check_host: config file line: `#[2001:7a8:185e::42:12]/64'
[saned] check_host: config file line: `X.X.X.0/24'
[saned] check_host: subnet with base IP = X.X.X.0, CIDR netmask = 24
[saned] check_host: access granted from IP address X.X.X.68 (in subnet X.X.X.0/24)
[saned] init: access granted
[saned] init: access granted to dsutil@::ffff:X.X.X.68
[saned] process_request: waiting for request
[saned] process_request: got request 1
[saned] process_request: waiting for request
[saned] process_request: got request 2
[saned] process_request: access to resource `hpaio' granted
[saned] process_request: sane_open returned: Success
[saned] process_request: waiting for request
[saned] process_request: got request 4
[saned] process_request: waiting for request
[saned] process_request: got request 5
[saned] process_request: waiting for request
[saned] process_request: got request 5
[saned] process_request: waiting for request
[saned] process_request: got request 5
[saned] process_request: waiting for request
[saned] process_request: got request 5
[saned] process_request: waiting for request
[saned] process_request: got request 5
[saned] process_request: waiting for request
[saned] process_request: got request 5
[saned] process_request: waiting for request
[saned] process_request: got request 5
[saned] process_request: waiting for request
[saned] process_request: got request 5
[saned] process_request: waiting for request
[saned] process_request: got request 5
[saned] process_request: waiting for request
[saned] process_request: got request 5
[saned] process_request: waiting for request
[saned] process_request: got request 5
[saned] process_request: waiting for request
[saned] process_request: got request 5
[saned] process_request: waiting for request
[saned] process_request: got request 5
[saned] process_request: waiting for request
[saned] process_request: got request 5
[saned] process_request: waiting for request
[saned] process_request: got request 5
[saned] process_request: waiting for request
[saned] process_request: got request 5
[saned] process_request: waiting for request
[saned] process_request: got request 5
[saned] process_request: waiting for request
[saned] process_request: got request 5
[saned] process_request: waiting for request
[saned] process_request: got request 5
[saned] process_request: waiting for request
[saned] process_request: got request 5
[saned] process_request: waiting for request
[saned] process_request: got request 5
[saned] process_request: waiting for request
[saned] process_request: got request 1
[saned] process_request: waiting for request
[saned] process_request: got request 3
[saned] process_request: waiting for request
[saned] process_request: got request 10
[saned] bailing out, waiting for children...
[saned] bail_out: all children exited
[sanei_debug] Setting debug level of net to 255.
[net] sane_init: authorize != null, version_code != null
[net] sane_init: SANE net backend version 1.0.14 (AF-indep+IPv6) from sane-backends 1.0.22
[net] sane_init: Client has little endian byte order
[net] sane_init: searching for config file
[net] sane_init: trying to add X.X.X.70
[net] add_device: adding backend X.X.X.70
[net] add_device: backend X.X.X.70 added
[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_open("X.X.X.70:hpaio:/usb/Officejet_J5700_series?serial=CN879CV07G0")
[net] sane_open: host = X.X.X.70, device = hpaio:/usb/Officejet_J5700_series?serial=CN879CV07G0
[net] sane_open: device found in list
[net] sane_open: device not connected yet...
[net] connect_dev: trying to connect to X.X.X.70
[net] net_avahi_browse_callback: NEW: service 'saned' of type '_sane-port._tcp' in domain 'local'
[net] connect_dev: [0] connection succeeded (IPv4)
[net] connect_dev: sanei_w_init
[net] connect_dev: net_init (user=dsutil, local version=1.0.3)
[net] net_avahi_browse_callback: NEW: service 'saned #2' of type '_sane-port._tcp' in domain 'local'
[net] net_avahi_browse_callback: CACHE_EXHAUSTED
[net] net_avahi_browse_callback: ALL_FOR_NOW
[net] net_avahi_resolve_callback: service 'saned' of type '_sane-port._tcp' in domain 'local':
[net] 	yoguisu2.local:6566 (fe80::1aa9:5ff:fe18:82b3)
	TXT="protovers=1000003"
	cookie is 0
	is_local: 0
	our_own: 0
	wide_area: 0
	multicast: 1
	cached: 1
[net] add_device: adding backend yoguisu2.local
[net] connect_dev: freeing init reply (status=Success, remote version=1.0.3)
[net] connect_dev: done
[net] sane_open: net_open
[net] sane_open: remote open failed
scanimage: open of device net:X.X.X.70:hpaio:/usb/Officejet_J5700_series?serial=CN879CV07G0 failed: Error during device I/O
[net] sane_get_devices: local_only = 0
[net] sane_get_devices: got X.X.X.70:hpaio:/usb/Officejet_J5700_series?serial=CN879CV07G04TC
[net] sane_get_devices: finished (1 devices)
[net] sane_exit: exiting
[net] net_avahi_cleanup: stopping thread
[net] add_device: error while getting address of host yoguisu2.local: Name or service not known
[net] net_avahi_resolve_callback: couldn't add backend with name yoguisu2.local
[net] add_device: adding backend "protovers=1000003"
[net] add_device: error while getting address of host "protovers=1000003": Name or service not known
[net] net_avahi_resolve_callback: couldn't add backend with IP address "protovers=1000003" either
[net] net_avahi_resolve_callback: service 'saned #2' of type '_sane-port._tcp' in domain 'local':
[net] 	yoguisu.local:6566 (fe80::21f:d0ff:fe9e:cbc5)
	TXT="protovers=1000003"
	cookie is 0
	is_local: 1
	our_own: 0
	wide_area: 0
	multicast: 1
	cached: 1
[net] add_device: adding backend yoguisu.local
[net] add_device: error while getting address of host yoguisu.local: Name or service not known
[net] net_avahi_resolve_callback: couldn't add backend with name yoguisu.local
[net] add_device: adding backend "protovers=1000003"
[net] add_device: error while getting address of host "protovers=1000003": Name or service not known
[net] net_avahi_resolve_callback: couldn't add backend with IP address "protovers=1000003" either
[net] net_avahi_cleanup: done
[net] sane_exit: closing dev 0xdfa9b0, ctl=6
[net] sane_exit: finished.
Usage: scanimage [OPTION]...

Start image acquisition on a scanner device and write image data to
standard output.

Parameters are separated by a blank from single-character options (e.g.
-d epson) and by a "=" from multi-character options (e.g. --device-name=epson).
-d, --device-name=DEVICE   use a given scanner device (e.g. hp:/dev/scanner)
    --format=pnm|tiff      file format of output file
-i, --icc-profile=PROFILE  include this ICC profile into TIFF file
-L, --list-devices         show available scanner devices
-f, --formatted-device-list=FORMAT similar to -L, but the FORMAT of the output
                           can be specified: %d (device name), %v (vendor),
                           %m (model), %t (type), %i (index number), and
                           %n (newline)
-b, --batch[=FORMAT]       working in batch mode, FORMAT is `out%d.pnm' or
                           `out%d.tif' by default depending on --format
    --batch-start=#        page number to start naming files with
    --batch-count=#        how many pages to scan in batch mode
    --batch-increment=#    increase page number in filename by #
    --batch-double         increment page number by two, same as
                           --batch-increment=2
    --batch-prompt         ask for pressing a key before scanning a page
    --accept-md5-only      only accept authorization requests using md5
-p, --progress             print progress messages
-n, --dont-scan            only set options, don't actually scan
-T, --test                 test backend thoroughly
-A, --all-options          list all available backend options
-h, --help                 display this help message and exit
-v, --verbose              give even more status messages
-B, --buffer-size=#        change input buffer size (in kB, default 32)
-V, --version              print version information
Type ``scanimage --help -d DEVICE'' to get list of all options for DEVICE.

List of available devices:
    net:X.X.X.70:hpaio:/usb/Officejet_J5700_series?serial=CN879CV07G04TC
[saned] main: starting debug mode (level 128)
[saned] read_config: searching for config file
[saned] read_config: done reading config
[saned] saned (AF-indep+IPv6) from sane-backends 1.0.21 starting up
[saned] do_bindings: trying to get port for service "sane-port" (getaddrinfo)
[saned] do_bindings: [1] socket () using IPv6
[saned] do_bindings: [1] setsockopt ()
[saned] do_bindings: [1] bind () to port 6566
[saned] do_bindings: [1] listen ()
[saned] do_bindings: [0] socket () using IPv4
[saned] do_bindings: [0] setsockopt ()
[saned] do_bindings: [0] bind () to port 6566
[saned] do_bindings: [0] bind failed: Address already in use
[saned] run_standalone: spawning Avahi process
[saned] run_standalone: waiting for control connection
[saned] saned_avahi_callback: AVAHI_CLIENT_S_RUNNING
[saned] saned_create_avahi_services: adding service 'saned'
[saned] saned_avahi_group_callback: service 'saned' successfully established
[saned] handle_connection: processing client connection
[saned] check_host: detected an IPv4-mapped address
[saned] check_host: access by remote host: ::ffff:X.X.X.68
[saned] check_host: remote host is not IN_LOOPBACK nor IN6_LOOPBACK
[saned] check_host: local hostname: yoguisu2
[saned] check_host: local hostname(s) (from DNS): yoguisu2
[saned] check_host: local hostname(s) (from DNS): (null)
[saned] check_host: local hostname(s) (from DNS): (null)
[saned] check_host: remote host doesn't have same addr as local
[saned] check_host: opening config file: /etc/hosts.equiv
[saned] check_host: can't open config file: /etc/hosts.equiv (No such file or directory)
[saned] check_host: opening config file: saned.conf
[saned] check_host: config file line: `# saned.conf'
[saned] check_host: config file line: `# Configuration for the saned daemon'
[saned] check_host: config file line: `'
[saned] check_host: config file line: `## Daemon options'
[saned] check_host: config file line: `# Port range for the data connection. Choose a range inside [1024 - 65535].'
[saned] check_host: config file line: `# Avoid specifying too large a range, for performance reasons.'
[saned] check_host: config file line: `#'
[saned] check_host: config file line: `# ONLY use this if your saned server is sitting behind a firewall. If your'
[saned] check_host: config file line: `# firewall is a Linux machine, we strongly recommend using the'
[saned] check_host: config file line: `# Netfilter nf_conntrack_sane connection tracking module instead.'
[saned] check_host: config file line: `#'
[saned] check_host: config file line: `# data_portrange = 10000 - 10100'
[saned] check_host: config file line: `'
[saned] check_host: config file line: `'
[saned] check_host: config file line: `## Access list'
[saned] check_host: config file line: `# A list of host names, IP addresses or IP subnets (CIDR notation) that'
[saned] check_host: config file line: `# are permitted to use local SANE devices. IPv6 addresses must be enclosed'
[saned] check_host: config file line: `# in brackets, and should always be specified in their compressed form.'
[saned] check_host: config file line: `#'
[saned] check_host: config file line: `# The hostname matching is not case-sensitive.'
[saned] check_host: config file line: `'
[saned] check_host: config file line: `#scan-client.somedomain.firm'
[saned] check_host: config file line: `#192.168.0.1'
[saned] check_host: config file line: `#192.168.0.1/29'
[saned] check_host: config file line: `#[2001:7a8:185e::42:12]'
[saned] check_host: config file line: `#[2001:7a8:185e::42:12]/64'
[saned] check_host: config file line: `X.X.X.0/24'
[saned] check_host: subnet with base IP = X.X.X.0, CIDR netmask = 24
[saned] check_host: access granted from IP address X.X.X.68 (in subnet X.X.X.0/24)
[saned] init: access granted
[saned] init: access granted to dsutil@::ffff:X.X.X.68
[saned] process_request: waiting for request
[saned] process_request: got request 2
[saned] process_request: access to resource `hpaio' granted
[saned] process_request: sane_open returned: Error during device I/O
[saned] process_request: waiting for request
[saned] process_request: got request 1
[saned] process_request: waiting for request
[saned] process_request: got request 10
[saned] bailing out, waiting for children...
[saned] bail_out: all children exited

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