Maintained by: NLnet Labs

[Unbound-users] Can't Bind Socket Error

Paul Stewart
Thu Oct 9 15:14:43 CEST 2014


Hi Wouter and thanks again for the prompt responses....

Here is the configuration to hopefully answer your questions.  I read
through the performance documentation and made several adjustments so
perhaps one of those changes were done in error.

Much appreciated,

Paul

#
# See unbound.conf(5) man page.
#
# this is a comment.

#Use this to include other text into the file.
#include: "otherfile.conf"

# The server clause sets the main parameters.
server:
	# whitespace is not necessary, but looks cleaner.

	# verbosity number, 0 is least verbose. 1 is default.
	verbosity: 1

	# print statistics to the log (for every thread) every N seconds.
	# Set to "" or 0 to disable. Default is disabled.
	# Needed for munin plugin
	statistics-interval: 60

	# enable cumulative statistics, without clearing them after
printing.
	# Needed for munin plugin
	statistics-cumulative: yes

	# enable extended statistics (query types, answer codes, status)
	# printed from unbound-control. default off, because of speed.
	# Needed for munin plugin
	extended-statistics: yes

	# number of threads to create. 1 disables threading.
	num-threads: 4

	# specify the interfaces to answer queries from by ip-address.
	# The default is to listen to localhost (127.0.0.1 and ::1).
	# specify 0.0.0.0 and ::0 to bind to all available interfaces.
	# specify every interface on a new 'interface:' labelled line.
	# The listen interfaces are not changed on reload, only on restart.
	interface: xx.xx.xx.90
	# interface: ::0
	# interface: 192.0.2.153
	# interface: 192.0.2.154
	# interface: 2001:DB8::5
	#
	# for dns over tls and raw dns over port 80
	# interface: 0.0.0.0 at 443
	# interface: ::0 at 443
	# interface: 0.0.0.0 at 80
	# interface: ::0 at 80

	# enable this feature to copy the source address of queries to
reply.
	# Socket options are not supported on all platforms. experimental.
	# interface-automatic: yes
	#
	# NOTE: Enable this option when specifying interface 0.0.0.0 or ::0
	# NOTE: Disabled per Fedora policy not to listen to * on default
install
	# NOTE: If deploying on non-default port, eg 80/443, this needs to
be disabled
	interface-automatic: no

	# port to answer queries from
	# port: 53

	# specify the interfaces to send outgoing queries to authoritative
	# server from by ip-address. If none, the default (all) interface
	# is used. Specify every interface on a 'outgoing-interface:' line.
	# outgoing-interface: 192.0.2.153
	# outgoing-interface: 2001:DB8::5
	# outgoing-interface: 2001:DB8::6

	# number of ports to allocate per thread, determines the size of the
	# port range that can be open simultaneously.
	outgoing-range: 200

	# permit unbound to use this port number or port range for
	# making outgoing queries, using an outgoing interface.
	# outgoing-port-permit: 32768

	# deny unbound the use this of port number or port range for
	# making outgoing queries, using an outgoing interface.
	# Use this to make sure unbound does not grab a UDP port that some
	# other server on this computer needs. The default is to avoid
	# IANA-assigned port numbers.
	# outgoing-port-avoid: "3200-3208"

	# number of outgoing simultaneous tcp buffers to hold per thread.
	# outgoing-num-tcp: 10

	# number of incoming simultaneous tcp buffers to hold per thread.
	# incoming-num-tcp: 10

	# buffer size for UDP port 53 incoming (SO_RCVBUF socket option).
	# 0 is system default.  Use 4m to catch query spikes for busy
servers.
	so-rcvbuf: 8m

	# buffer size for UDP port 53 outgoing (SO_SNDBUF socket option).
	# 0 is system default.  Use 4m to handle spikes on very busy
servers.
	so-sndbuf: 8m

	# EDNS reassembly buffer to advertise to UDP peers (the actual
buffer
	# is set with msg-buffer-size). 1480 can solve fragmentation
(timeouts).
	# edns-buffer-size: 4096

	# buffer size for handling DNS data. No messages larger than this
	# size can be sent or received, by UDP or TCP. In bytes.
	# msg-buffer-size: 65552

	# the amount of memory to use for the message cache.
	# plain value in bytes or you can append k, m or G. default is
"4Mb".
	# msg-cache-size: 4m

	# the number of slabs to use for the message cache.
	# the number of slabs must be a power of 2.
	# more slabs reduce lock contention, but fragment memory usage.
	msg-cache-slabs: 4

	# the number of queries that a thread gets to service.
	num-queries-per-thread: 100

	# if very busy, 50% queries run to completion, 50% get timeout in
msec
	# jostle-timeout: 200

	# the amount of memory to use for the RRset cache.
	# plain value in bytes or you can append k, m or G. default is
"4Mb".
	rrset-cache-size: 2G

	# the number of slabs to use for the RRset cache.
	# the number of slabs must be a power of 2.
	# more slabs reduce lock contention, but fragment memory usage.
	rrset-cache-slabs: 4

	# the time to live (TTL) value lower bound, in seconds. Default 0.
	# If more than an hour could easily give trouble due to stale data.
	# cache-min-ttl: 0

	# the time to live (TTL) value cap for RRsets and messages in the
	# cache. Items are not cached for longer. In seconds.
	# cache-max-ttl: 86400

	# the time to live (TTL) value for cached roundtrip times, lameness
	# and EDNS version information for hosts. In seconds.
	# infra-host-ttl: 900

	# the number of slabs to use for the Infrastructure cache.
	# the number of slabs must be a power of 2.
	# more slabs reduce lock contention, but fragment memory usage.
	infra-cache-slabs: 4

	# the maximum number of hosts that are cached (roundtrip, EDNS,
lame).
	# infra-cache-numhosts: 10000

	# Enable IPv4, "yes" or "no".
	do-ip4: yes

	# Enable IPv6, "yes" or "no".
	# do-ip6: yes

	# Enable UDP, "yes" or "no".
	# NOTE: if setting up an unbound on tls443 for public use, you might
want to
	# disable UDP to avoid being used in DNS amplification attacks.
	do-udp: yes

	# Enable TCP, "yes" or "no".
	do-tcp: no

	# upstream connections use TCP only (and no UDP), "yes" or "no"
	# useful for tunneling scenarios, default no.
	# tcp-upstream: no

	# Detach from the terminal, run in background, "yes" or "no".
	# do-daemonize: yes

	# control which clients are allowed to make (recursive) queries
	# to this server. Specify classless netblocks with /size and action.
	# By default everything is refused, except for localhost.
	# Choose deny (drop message), refuse (polite error reply),
	# allow (recursive ok), allow_snoop (recursive and nonrecursive ok)
	# access-control: 0.0.0.0/0 refuse
	access-control: xxx.xxx.xx.0/19 allow
	access-control: xx.xxx.xx.0/19 allow
	access-control: xx.xxx.xx.0/18 allow
	access-control: xx.xxx.0.0/18 allow
	access-control: xxx.xxx.xxx.0/17 allow
	# access-control: ::0/0 refuse
	# access-control: ::1 allow
	# access-control: ::ffff:127.0.0.1 allow

	# if given, a chroot(2) is done to the given directory.
	# i.e. you can chroot to the working directory, for example,
	# for extra security, but make sure all files are in that directory.
	#
	# If chroot is enabled, you should pass the configfile (from the
	# commandline) as a full path from the original root. After the
	# chroot has been performed the now defunct portion of the config
	# file path is removed to be able to reread the config after a
reload.
	#
	# All other file paths (working dir, logfile, roothints, and
	# key files) can be specified in several ways:
	# 	o as an absolute path relative to the new root.
	# 	o as a relative path to the working directory.
	# 	o as an absolute path relative to the original root.
	# In the last case the path is adjusted to remove the unused
portion.
	#
	# The pid file can be absolute and outside of the chroot, it is
	# written just prior to performing the chroot and dropping
permissions.
	#
	# Additionally, unbound may need to access /dev/random (for
entropy).
	# How to do this is specific to your OS.
	#
	# If you give "" no chroot is performed. The path must not end in a
/.
	# chroot: "/var/lib/unbound"
	chroot: ""

	# if given, user privileges are dropped (after binding port),
	# and the given username is assumed. Default is user "unbound".
	# If you give "" no privileges are dropped.
	username: "unbound"

	# the working directory. The relative files in this config are
	# relative to this directory. If you give "" the working directory
	# is not changed.
	directory: "/etc/unbound"

	# the log file, "" means log to stderr.
	# Use of this option sets use-syslog to "no".
	# logfile: ""

	# Log to syslog(3) if yes. The log facility LOG_DAEMON is used to
	# log to, with identity "unbound". If yes, it overrides the logfile.
	# use-syslog: yes

	# print UTC timestamp in ascii to logfile, default is epoch in
seconds.
	log-time-ascii: yes

	# the pid file. Can be an absolute path outside of chroot/work dir.
	pidfile: "/var/run/unbound/unbound.pid"

	# file to read root hints from.
	# get one from ftp://FTP.INTERNIC.NET/domain/named.cache
	# root-hints: ""

	# enable to not answer id.server and hostname.bind queries.
	# hide-identity: no

	# enable to not answer version.server and version.bind queries.
	# hide-version: no

	# the identity to report. Leave "" or default to return hostname.
	# identity: ""

	# the version to report. Leave "" or default to return package
version.
	# version: ""

	# the target fetch policy.
	# series of integers describing the policy per dependency depth.
	# The number of values in the list determines the maximum dependency
	# depth the recursor will pursue before giving up. Each integer
means:
	# 	-1 : fetch all targets opportunistically,
	# 	0: fetch on demand,
	#	positive value: fetch that many targets opportunistically.
	# Enclose the list of numbers between quotes ("").
	# target-fetch-policy: "3 2 1 0 0"

	# Harden against very small EDNS buffer sizes.
	# harden-short-bufsize: no

	# Harden against unseemly large queries.
	# harden-large-queries: no

	# Harden against out of zone rrsets, to avoid spoofing attempts.
	harden-glue: yes

	# Harden against receiving dnssec-stripped data. If you turn it
	# off, failing to validate dnskey data for a trustanchor will
	# trigger insecure mode for that zone (like without a trustanchor).
	# Default on, which insists on dnssec data for trust-anchored zones.
	harden-dnssec-stripped: yes

	# Harden against queries that fall under dnssec-signed nxdomain
names.
	harden-below-nxdomain: yes

	# Harden the referral path by performing additional queries for
	# infrastructure data.  Validates the replies (if possible).
	# Default off, because the lookups burden the server.  Experimental
	# implementation of
draft-wijngaards-dnsext-resolver-side-mitigation.
	harden-referral-path: yes

	# Use 0x20-encoded random bits in the query to foil spoof attempts.
	# This feature is an experimental implementation of draft dns-0x20.
	# (this now fails on all GoDaddy customer domains, so disabled)
	use-caps-for-id: no

	# Enforce privacy of these addresses. Strips them away from answers.
	# It may cause DNSSEC validation to additionally mark it as bogus.
	# Protects against 'DNS Rebinding' (uses browser as network proxy).
	# Only 'private-domain' and 'local-data' names are allowed to have
	# these private addresses. No default.
	# private-address: 10.0.0.0/8
	# private-address: 172.16.0.0/12
	# private-address: 192.168.0.0/16
	# private-address: 192.254.0.0/16
	# private-address: fd00::/8
	# private-address: fe80::/10

	# Allow the domain (and its subdomains) to contain private
addresses.
	# local-data statements are allowed to contain private addresses
too.
	# private-domain: "example.com"

	# If nonzero, unwanted replies are not only reported in statistics,
	# but also a running total is kept per thread. If it reaches the
	# threshold, a warning is printed and a defensive action is taken,
	# the cache is cleared to flush potential poison out of it.
	# A suggested value is 10000000, the default is 0 (turned off).
	unwanted-reply-threshold: 10000000

	# Do not query the following addresses. No DNS queries are sent
there.
	# List one address per entry. List classless netblocks with /size,
	# do-not-query-address: 127.0.0.1/8
	# do-not-query-address: ::1

	# if yes, the above default do-not-query-address entries are
present.
	# if no, localhost can be queried (for testing and debugging).
	# do-not-query-localhost: yes

	# if yes, perform prefetching of almost expired message cache
entries.
	prefetch: yes

	# if yes, perform key lookups adjacent to normal lookups.
	prefetch-key: yes

	# if yes, Unbound rotates RRSet order in response.
	rrset-roundrobin: yes

	# if yes, Unbound doesn't insert authority/additional sections
	# into response messages when those sections are not required.
	minimal-responses: yes

	# module configuration of the server. A string with identifiers
	# separated by spaces. "iterator" or "validator iterator"
	# module-config: "validator iterator"

	# File with DLV trusted keys. Same format as trust-anchor-file.
	# There can be only one DLV configured, it is trusted from root
down.
	# Downloaded from https://secure.isc.org/ops/dlv/dlv.isc.org.key
	dlv-anchor-file: "/etc/unbound/dlv.isc.org.key"

	# File with trusted keys for validation. Specify more than one file
	# with several entries, one file per entry.
	# Zone file format, with DS and DNSKEY entries.
	# trust-anchor-file: ""

	# File with trusted keys, kept uptodate using RFC5011 probes,
	# initial file like trust-anchor-file, then it stores metadata.
	# Use several entries, one per domain name, to track multiple zones.
	# auto-trust-anchor-file: ""

	# Trusted key for validation. DS or DNSKEY. specify the RR on a
	# single line, surrounded by "". TTL is ignored. class is IN
default.
	# (These examples are from August 2007 and may not be valid
anymore).
	# trust-anchor: "nlnetlabs.nl. DNSKEY 257 3 5
AQPzzTWMz8qSWIQlfRnPckx2BiVmkVN6LPupO3mbz7FhLSnm26n6iG9N
Lby97Ji453aWZY3M5/xJBSOS2vWtco2t8C0+xeO1bc/d6ZTy32DHchpW 6rDH1vp8
6Ll+ha0tmwyy9QP7y2bVw5zSbFCrefk8qCUBgfHm9bHzMG1U BYtEIQ=="
	# trust-anchor: "jelte.nlnetlabs.nl. DS 42860 5 1
14D739EB566D2B1A5E216A0BA4D17FA9B038BE4A"

	# File with trusted keys for validation. Specify more than one file
	# with several entries, one file per entry. Like trust-anchor-file
	# but has a different file format. Format is BIND-9 style format,
	# the trusted-keys { name flag proto algo "key"; }; clauses are
read.
	# trusted-keys-file: ""
	#
	# trusted-keys-file: /etc/unbound/rootkey.bind
	trusted-keys-file: /etc/unbound/keys.d/*.key
	auto-trust-anchor-file: "/var/lib/unbound/root.key"

	# Ignore chain of trust. Domain is treated as insecure.
	# domain-insecure: "example.com"

	# Override the date for validation with a specific fixed date.
	# Do not set this unless you are debugging signature inception
	# and expiration. "" or "0" turns the feature off.
	# val-override-date: ""

	# The time to live for bogus data, rrsets and messages. This avoids
	# some of the revalidation, until the time interval expires. in
secs.
	# val-bogus-ttl: 60

	# The signature inception and expiration dates are allowed to be off
	# by 10% of the lifetime of the signature from our local clock.
	# This leeway is capped with a minimum and a maximum.  In seconds.
	# val-sig-skew-min: 3600
	# val-sig-skew-max: 86400

	# Should additional section of secure message also be kept clean of
	# unsecure data. Useful to shield the users of this validator from
	# potential bogus data in the additional section. All unsigned data
	# in the additional section is removed from secure messages.
	val-clean-additional: yes

	# Turn permissive mode on to permit bogus messages. Thus, messages
	# for which security checks failed will be returned to clients,
	# instead of SERVFAIL. It still performs the security checks, which
	# result in interesting log files and possibly the AD bit in
	# replies if the message is found secure. The default is off.
	# NOTE: TURNING THIS ON DISABLES ALL DNSSEC SECURITY
	val-permissive-mode: no

	# Have the validator log failed validations for your diagnosis.
	# 0: off. 1: A line per failed user query. 2: With reason and bad
IP.
	val-log-level: 1

	# It is possible to configure NSEC3 maximum iteration counts per
	# keysize. Keep this table very short, as linear search is done.
	# A message with an NSEC3 with larger count is marked insecure.
	# List in ascending order the keysize and count values.
	# val-nsec3-keysize-iterations: "1024 150 2048 500 4096 2500"

	# instruct the auto-trust-anchor-file probing to add anchors after
ttl.
	# add-holddown: 2592000 # 30 days

	# instruct the auto-trust-anchor-file probing to del anchors after
ttl.
	# del-holddown: 2592000 # 30 days

	# auto-trust-anchor-file probing removes missing anchors after ttl.
	# If the value 0 is given, missing anchors are not removed.
	# keep-missing: 31622400 # 366 days

	# the amount of memory to use for the key cache.
	# plain value in bytes or you can append k, m or G. default is
"4Mb".
	# key-cache-size: 4m

	# the number of slabs to use for the key cache.
	# the number of slabs must be a power of 2.
	# more slabs reduce lock contention, but fragment memory usage.
	key-cache-slabs: 4

	# the amount of memory to use for the negative cache (used for DLV).
	# plain value in bytes or you can append k, m or G. default is
"1Mb".
	# neg-cache-size: 1m

	# a number of locally served zones can be configured.
	# 	local-zone: <zone> <type>
	# 	local-data: "<resource record string>"
	# o deny serves local data (if any), else, drops queries.
	# o refuse serves local data (if any), else, replies with error.
	# o static serves local data, else, nxdomain or nodata answer.
	# o transparent serves local data, but resolves normally for other
names
	# o redirect serves the zone data for any subdomain in the zone.
	# o nodefault can be used to normally resolve AS112 zones.
	# o typetransparent resolves normally for other types and other
names
	#
	# defaults are localhost address, reverse for 127.0.0.1 and ::1
	# and nxdomain for AS112 zones. If you configure one of these zones
	# the default content is omitted, or you can omit it with
'nodefault'.
	#
	# If you configure local-data without specifying local-zone, by
	# default a transparent local-zone is created for the data.
	#
	# You can add locally served data with
	# local-zone: "local." static
	# local-data: "mycomputer.local. IN A 192.0.2.51"
	# local-data: 'mytext.local TXT "content of text record"'
	#
	# You can override certain queries with
	# local-data: "adserver.example.com A 127.0.0.1"
	#
	# You can redirect a domain to a fixed address with
	# (this makes example.com, www.example.com, etc, all go to
192.0.2.3)
	# local-zone: "example.com" redirect
	# local-data: "example.com A 192.0.2.3"
	#
	# Shorthand to make PTR records, "IPv4 name" or "IPv6 name".
	# You can also add PTR records using local-data directly, but then
	# you need to do the reverse notation yourself.
	# local-data-ptr: "192.0.2.3 www.example.com"

	include: /etc/unbound/local.d/*.conf

	# service clients over SSL (on the TCP sockets), with plain DNS
inside
	# the SSL stream.  Give the certificate to use and private key.
	# default is "" (disabled).  requires restart to take effect.
	# ssl-service-key: "/etc/unbound/unbound_server.key"
	# ssl-service-pem: "/etc/unbound/unbound_server.pem"
	# ssl-port: 443

	# request upstream over SSL (with plain DNS inside the SSL stream).
	# Default is no.  Can be turned on and off with unbound-control.
	# ssl-upstream: no

## Python config section. To enable:
## o use --with-pythonmodule to configure before compiling.
## o list python in the module-config string (above) to enable.
## o and give a python-script to run.
#python:
#	# Script file to load
#	# python-script: "/etc/unbound/ubmodule-tst.py"


# Remote control config section.
remote-control:
	# Enable remote control with unbound-control(8) here.
	# set up the keys and certificates with unbound-control-setup.
	# Note: required for unbound-munin package
	control-enable: yes

	# what interfaces are listened to for remote control.
	# give 0.0.0.0 and ::0 to listen to all interfaces.
	# control-interface: 127.0.0.1
	# control-interface: ::1

	# port number for remote control operations.
	# control-port: 953

	# unbound server key file.
	server-key-file: "/etc/unbound/unbound_server.key"

	# unbound server certificate file.
	server-cert-file: "/etc/unbound/unbound_server.pem"

	# unbound-control key file.
	control-key-file: "/etc/unbound/unbound_control.key"

	# unbound-control certificate file.
	control-cert-file: "/etc/unbound/unbound_control.pem"

# Stub and Forward zones

include: /etc/unbound/conf.d/*.conf

# Stub zones.
# Create entries like below, to make all queries for 'example.com' and
# 'example.org' go to the given list of nameservers. list zero or more
# nameservers by hostname or by ipaddress. If you set stub-prime to yes,
# the list is treated as priming hints (default is no).
# stub-zone:
#	name: "example.com"
#	stub-addr: 192.0.2.68
#	stub-prime: "no"
# stub-zone:
#	name: "example.org"
#	stub-host: ns.example.com.
# You can now also dynamically create and delete stub-zone's using
# unbound-control stub_add domain.com 1.2.3.4 5.6.7.8
# unbound-control stub_remove domain.com 1.2.3.4 5.6.7.8

# Forward zones
# Create entries like below, to make all queries for 'example.com' and
# 'example.org' go to the given list of servers. These servers have to
handle
# recursion to other nameservers. List zero or more nameservers by hostname
# or by ipaddress. Use an entry with name "." to forward all queries.
# If you enable forward-first, it attempts without the forward if it fails.
# forward-zone:
# 	name: "example.com"
# 	forward-addr: 192.0.2.68
# 	forward-addr: 192.0.2.73 at 5355  # forward to port 5355.
# 	forward-first: no
# forward-zone:
# 	name: "example.org"
# 	forward-host: fwd.example.com
#
# You can now also dynamically create and delete forward-zone's using
# unbound-control forward_add domain.com 1.2.3.4 5.6.7.8
# unbound-control forward_remove domain.com 1.2.3.4 5.6.7.8

-----Original Message-----
From: Unbound-users [mailto:unbound-users-bounces at unbound.net] On Behalf Of
W.C.A. Wijngaards
Sent: Thursday, October 09, 2014 7:54 AM
To: unbound-users at unbound.net
Subject: Re: [Unbound-users] Can't Bind Socket Error

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi Paul,

Did you configure the interface or the outgoing-interface?  In any case,
0.0.0.0 or your IP giving permission denied once in a while is bad.
Something is wrong with your system somehow, and it is intermittent.  Are
there port numbers that are not allowed by system policy that you have
enabled in unbound.conf (by default it skips
<1024 ports) ?

Best regards,
   Wouter

On 09/10/14 13:42, Paul Stewart wrote:
> Thank you for the response.  There is only one interface configured in 
> the CentOS and IPv6 is disabled (for now - it will be turned up 
> shortly).
> 
> In the configuration of Unbound, I specified the IP address (there is 
> only one) - should I perhaps change the IP to 0.0.0.0?  It doesn't 
> appear that the error in the log file is causing any serious issues 
> ....
> 
> Cheers, Paul
> 
> 
>> 
>> We just started migrating some of our customer base over to Unbound.
>> 
>> 
>> 
>> Server is VM instance (VmWare) with 8 Gig RAM, 4 vCPU's running 
>> CentOS 7 (64 bit).  Unbound version 1.4.20 via YUM package install.
> 
> The socket bind this late is for queries to upstream authority 
> servers, it is trying to bind one of the outgoing-interface IP 
> addresses.  If you configured it, one of those addresses is not 
> actually served by your system (or the VM).  Another option is that 
> IPv6 is broken in the VM and binding the ipv6 fd to ::0 fails.
> 
> Best regards, Wouter
> 
>> We started noticing the following errors in the logs this
>> evening:
>> 
>> 
>> 
>> Oct  8 19:48:51 dns2-pppoe unbound: [1110:0] error: can't bind
>> *socket*: Permission denied
> 
> 
> _______________________________________________ Unbound-users mailing 
> list Unbound-users at unbound.net 
> http://unbound.nlnetlabs.nl/mailman/listinfo/unbound-users
> 

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