[Bug 1574415] Re: [16.04] ssh <host>: Bad protocol spec '1'

Launchpad Bug Tracker 1574415 at bugs.launchpad.net
Tue May 24 17:58:28 UTC 2016

Status changed to 'Confirmed' because the bug affects multiple users.

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

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  [16.04] ssh <host>: Bad protocol spec '1'

Status in openssh package in Ubuntu:

Bug description:
  After upgrade to 16.04 ssh client will not connect to any host,

  /home/tj/.ssh/config line 109: Bad protocol spec '1'.

  The entry is:

  Host ups-01
  User hostmaster
  IdentityFile ~/.ssh/id_hostmaster
  IdentitiesOnly yes
  Protocol 1

  If this were an entry in /etc/ssh/ssh_config and the user had no
  privileges to edit that file it could create a denial of service to
  the ssh client (if the user doesn't know how to over-ride the config).

  It would be helpful if the openssh-client postinst script were to grep
  the standard config files (including for users) and add a warning to
  the motd and syslog if any invalidated configuration statements are

  This will especially affect connections to embedded devices - in this
  case it is an ssh server on a management VLAN in one of several
  network-attached Uninterruptable Power Supplies that cannot be
  upgraded, and only support Protocol 1.

  According to the 16.04 Release Notes protocol 1 requires the openssh-
  client-ssh1 package with the ssh1 binary.

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