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[jhartr7 <jon_hart@xxxxxxxxxx>]

Thanks Robie.  I think you may have misunderstood what the bug is.  The
quote you reference is not really relevant in this case, because what I
am reporting isn't that something goes wrong when a port is not
specified.

The important line from the documentation is this, which I provided
originally:

"Additionally, any Port options must precede this option for non-port
qualified addresses."

So, yes, my configuration is invalid, but the behavior of sshd when this
happens and the experience around it could use improvement.  If it
detects that the configuration is invalid, it should flag it as such and
make it obvious from the logs/stdout/stdterr rather than letting the
process try to restart and falsely report that it restarted
successfully, because it didn't.

I agree that part of this could legitimately be a bug in OpenSSH.

** Changed in: openssh (Ubuntu)
       Status: Invalid => Opinion

** Changed in: openssh (Ubuntu)
       Status: Opinion => New

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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:
  New

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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