Bug#360151: ssh: port forwarding does not work using connection sharing when not master

[Oliver Kurth <okurth@gmx.net>]

Package: ssh
Version: 1:4.2p1-7
Severity: normal

I have this in my .ssh/config:

Host *
  ControlMaster auto
  ControlPath /home/oku/.ssh/%r@%h:%p

This works fine, except when I want to use port forwarding using eg.

ssh -C -L 8080:127.0.0.1:80 remotehost

when this is not the first connection to remotehost. The local port is not listening:

oku@nimrod:~$ netstat -ln|grep 8080
oku@nimrod:~$

However, after terminating all ssh sessions, including the master, and try again, so
that this time the port forwarding sessions becomes the master, it works fine:

oku@nimrod:~$ netstat -ln|grep 8080
tcp        0      0 127.0.0.1:8080          0.0.0.0:*               LISTEN
tcp6       0      0 ::1:8080                :::*                    LISTEN
oku@nimrod:~$

-- System Information:
Debian Release: testing/unstable
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'stable')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.16-1-686
Locale: LANG=en_US, LC_CTYPE=en_US (charmap=ISO-8859-1)

Versions of packages ssh depends on:
ii  openssh-client                1:4.2p1-7  Secure shell client, an rlogin/rsh
ii  openssh-server                1:4.2p1-7  Secure shell server, an rshd repla

ssh recommends no packages.

-- debconf information:
  ssh/insecure_rshd:
  ssh/ssh2_keys_merged:
  ssh/user_environment_tell:
* ssh/forward_warning:
  ssh/insecure_telnetd:
  ssh/new_config: true
* ssh/use_old_init_script: true
  ssh/protocol2_only: true
  ssh/encrypted_host_key_but_no_keygen:
  ssh/run_sshd: true
  ssh/SUID_client: true
* ssh/disable_cr_auth: false