[Bug 1193620] Re: ssh disconnect escape sequence doesn't work on a broken multiplexed connection

[Olathe]

An imperfect workaround is to add the following line to the configuration:
  ServerAliveInterval 15

The client then automatically closes the connection after 3 failed
connectivity checks in a row. The checks are done every 15 seconds.

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https://bugs.launchpad.net/bugs/1193620

Title:
  ssh disconnect escape sequence doesn't work on a broken multiplexed
  connection

Status in “openssh” package in Ubuntu:
  New

Bug description:
  I use the following SSH configuration options:
    ControlMaster auto
    ControlPath ~/.ssh/.socket-%r@%h:%p
    ControlPersist 60

  It looks as if it's configured correctly because opening multiple
  connections using the same username and host-port combination shares
  the first connection.

  [Enter], [~], [.] closes each session individually, which is great.
  However, that disconnect escape sequence appears to do absolutely
  nothing if the multiplexed connection dies abnormally (for instance,
  if my WiFi connection dies), which is the time when I most need the
  disconnect sequence to work, since I'm not going to be doing much on
  that dead session anymore, and I'd like to restart it.

  [Enter], [~], [.] works fine on a *nonmultiplexed* connection when it
  dies abnormally.

  ======

  $ lsb_release -rd
  Description:	Ubuntu 13.04
  Release:	13.04

  $ apt-cache policy openssh-client
  openssh-client:
    Installed: 1:6.1p1-4
    Candidate: 1:6.1p1-4
    Version table:
   *** 1:6.1p1-4 0
          500 http://us.archive.ubuntu.com/ubuntu/ raring/main amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: openssh-client 1:6.1p1-4
  ProcVersionSignature: Ubuntu 3.8.0-23.34-generic 3.8.11
  Uname: Linux 3.8.0-23-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8.1
  Architecture: amd64
  Date: Sat Jun 22 09:01:57 2013
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2013-04-04 (78 days ago)
  InstallationMedia: Lubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.1)
  MarkForUpload: True
  RelatedPackageVersions:
   ssh-askpass       N/A
   libpam-ssh        N/A
   keychain          N/A
   ssh-askpass-gnome N/A
  SSHClientVersion: OpenSSH_6.1p1 Debian-4, OpenSSL 1.0.1c 10 May 2012
  SourcePackage: openssh
  UpgradeStatus: Upgraded to raring on 2013-05-25 (27 days ago)

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