[Bug 1877496] Re: focal sshd snubs VX Connectbot

[Christian Ehrhardt ]

Hi,
this seems to be this upstream issue:
https://github.com/vx/connectbot/issues/141

These things come every now and then, in [1] you see more such being dropped in the past.
Until the client is able to use the newer key exchanges you might need to make your server less secure by adding to /etc/ssh/sshd_config:
KexAlgorithms +diffie-hellman-group14-sha1

I think from Ubuntu's POV we are good, we are not changing the default
to be less secure but users who want to to so can do that in their local
confid.

Marking as invalid since (for your specific case) it appears as a
configuration issue (due to the broken client missing the more modern
option).

[1]: https://www.openssh.com/legacy.html

** Bug watch added: github.com/vx/connectbot/issues #141
   https://github.com/vx/connectbot/issues/141

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

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https://bugs.launchpad.net/bugs/1877496

Title:
  focal sshd snubs VX Connectbot

Status in openssh package in Ubuntu:
  Incomplete

Bug description:
  what is the subtle change to sshd such that now VX Connectbot no
  longer gets any response?  VX Connectbot can connect to the bionic
  sshd just fine, even if it's running on the focal kernel.  but gets no
  response from the focal sshd.  what's up with that?

  yes meanwhile it works fine to connect to the focal sshd from
  elsewhere eg from the bionic ssh client.  so what's the subtle snub to
  VX Connectbot?

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: openssh-server 1:8.2p1-4
  ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
  Uname: Linux 5.4.0-26-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Thu May  7 21:21:26 2020
  InstallationDate: Installed on 2020-03-15 (53 days ago)
  InstallationMedia: Lubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200314)
  ProcEnviron:
   LC_TIME=en_DK.utf8
   TERM=screen
   PATH=(custom, no user)
   LANG=en_US.utf8
   SHELL=/bin/bash
  SSHDConfig: Error: command ['/usr/sbin/sshd', '-T'] failed with exit code 255: Missing privilege separation directory: /run/sshd
  SourcePackage: openssh
  UpgradeStatus: No upgrade log present (probably fresh install)

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