Public bug reported:
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)
** Affects: openssh (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug precise running-unity
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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
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https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/1521745/+subscriptions
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