I've attached my mostly default configuration that does not exhibit the
problem as well as the configuration that does exhibit the problem.
Obviously, to reproduce this you'll need to use a ListenAddress and
perhaps a Port argument that suits your setup.
To reproduce this, take my original configuration, or simply ensure that
your sshd_config has no ListenAddress or Port arguments (anywhere, in
any order), and restart sshd, confirming it is listening on 22/TCP as
normal:
$ sudo /etc/init.d/ssh restart
Rather than invoking init scripts through /etc/init.d, use the service(8)
utility, e.g. service ssh restart
Since the script you are attempting to invoke has been converted to an
Upstart job, you may also use the stop(8) and then start(8) utilities,
e.g. stop ssh ; start ssh. The restart(8) utility is also available.
ssh stop/waiting
ssh start/running, process 5968
$ sudo lsof -np 5968 |grep LISTEN
lsof: WARNING: can't stat() fuse.gvfs-fuse-daemon file system /home/jhart/.gvfs
Output information may be incomplete.
sshd 5968 root 3u IPv4 8942314 0t0 TCP *:ssh (LISTEN)
sshd 5968 root 4u IPv6 8942316 0t0 TCP *:ssh (LISTEN)
Then, take my modified configuration, or ensure that your ListenAddress
specification is before the Port argument and the ListenAddress is set to
something other than 0.0.0.0 (I think), and then restart sshd. You'll see that
it didn't start, and is not running or listening:
$ sudo /etc/init.d/ssh restart
Rather than invoking init scripts through /etc/init.d, use the service(8)
utility, e.g. service ssh restart
Since the script you are attempting to invoke has been converted to an
Upstart job, you may also use the stop(8) and then start(8) utilities,
e.g. stop ssh ; start ssh. The restart(8) utility is also available.
ssh stop/waiting
ssh start/running, process 6008
$ sudo lsof -np 6008 |grep LISTEN
lsof: WARNING: can't stat() fuse.gvfs-fuse-daemon file system /home/jhart/.gvfs
Output information may be incomplete.
[ jhart@jhart-laptop (12/11/15 11:21:17) ~ <err: 1> ]
$ ps aux |grep sshd
jhart 6048 0.0 0.0 9388 924 pts/4 S+ 11:21 0:00 grep sshd
If you then swap the order of the ListenAddress and Port arguments, or use the
combined ListenAddress:Port option, this works fine.
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https://bugs.launchpad.net/bugs/1521745
Title:
sshd will fail to start or restart if non-default Port option is
incorrectly put after a non-default ListenAddress
Status in openssh package in Ubuntu:
Incomplete
Bug description:
I have a system where the default listening port is changed for sshd,
done at the bottom of my sshd_config. I recently changed the
ListenAddress from its default (unset, which listens on all
interfaces) to bind to a specific IP. The resulting relevant snippet
of my sshd_config was:
ListenAddress my_ip_here
Port 12345
I then restarted ssh with /etc/init.d/ssh restart and found that ssh
was not listening.
Re-reading the manpage, I see this:
ListenAddress
Specifies the local addresses sshd(8) should listen on. The fol‐
lowing forms may be used:
ListenAddress host|IPv4_addr|IPv6_addr
ListenAddress host|IPv4_addr:port
ListenAddress [host|IPv6_addr]:port
If port is not specified, sshd will listen on the address and all
prior Port options specified. The default is to listen on all
local addresses. Multiple ListenAddress options are permitted.
Additionally, any Port options must precede this option for non-
port qualified addresses.
On a hunch, I remove the Port line and simply change my relevant
config to:
ListenAddress my_ip_here:12345
sshd then restarted just fine.
In looking at the logs, I see:
Dec 1 11:40:26 jhart-laptop kernel: [1207947.954263] init: ssh main process
(26655) terminated with status 255
Dec 1 11:40:26 jhart-laptop kernel: [1207947.954277] init: ssh main process
ended, respawning
Dec 1 11:40:26 jhart-laptop kernel: [1207947.957687] init: ssh main process
(26658) terminated with status 255
Dec 1 11:40:26 jhart-laptop kernel: [1207947.957703] init: ssh main process
ended, respawning
Dec 1 11:40:26 jhart-laptop kernel: [1207947.961094] init: ssh main process
(26661) terminated with status 255
Dec 1 11:40:26 jhart-laptop kernel: [1207947.961115] init: ssh main process
ended, respawning
Dec 1 11:40:26 jhart-laptop kernel: [1207947.964835] init: ssh main process
(26664) terminated with status 255
Dec 1 11:40:26 jhart-laptop kernel: [1207947.964852] init: ssh main process
ended, respawning
Dec 1 11:40:26 jhart-laptop kernel: [1207947.968028] init: ssh main process
(26667) terminated with status 255
Dec 1 11:40:26 jhart-laptop kernel: [1207947.968043] init: ssh main process
ended, respawning
Dec 1 11:40:26 jhart-laptop kernel: [1207947.971004] init: ssh main process
(26670) terminated with status 255
Dec 1 11:40:26 jhart-laptop kernel: [1207947.971021] init: ssh main process
ended, respawning
Dec 1 11:40:26 jhart-laptop kernel: [1207947.974044] init: ssh main process
(26673) terminated with status 255
Dec 1 11:40:26 jhart-laptop kernel: [1207947.974087] init: ssh main process
ended, respawning
Dec 1 11:40:26 jhart-laptop kernel: [1207947.977853] init: ssh main process
(26676) terminated with status 255
Dec 1 11:40:26 jhart-laptop kernel: [1207947.977868] init: ssh main process
ended, respawning
Dec 1 11:40:26 jhart-laptop kernel: [1207947.980928] init: ssh main process
(26679) terminated with status 255
Dec 1 11:40:26 jhart-laptop kernel: [1207947.980944] init: ssh main process
ended, respawning
Dec 1 11:40:26 jhart-laptop kernel: [1207947.984059] init: ssh main process
(26682) terminated with status 255
Dec 1 11:40:26 jhart-laptop kernel: [1207947.984075] init: ssh main process
ended, respawning
Dec 1 11:40:26 jhart-laptop kernel: [1207947.987118] init: ssh main process
(26685) terminated with status 255
Dec 1 11:40:26 jhart-laptop kernel: [1207947.987132] init: ssh respawning
too fast, stopped
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: openssh-server 1:5.9p1-5ubuntu1.7
ProcVersionSignature: Ubuntu 3.13.0-66.108~precise1-generic 3.13.11-ckt27
Uname: Linux 3.13.0-66-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.13
Architecture: amd64
Date: Tue Dec 1 11:54:42 2015
InstallationMedia: Ubuntu 12.04.5 LTS "Precise Pangolin" - Release amd64
(20140807)
MarkForUpload: True
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/zsh
SourcePackage: openssh
UpgradeStatus: No upgrade log present (probably fresh install)
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https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/1521745/+subscriptions
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