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Bug#651357: ssh often dies with "Disconnecting: Received open failure for non-opening channel 3."

Package: openssh-client
Version: 1:5.9p1-2
Severity: normal

I use a jumphost to connect to remote servers, something like:

ssh $jumphost
ssh -o ProxyCommand=ssh -q -a -x -W %h:%p $jumphost root@$target

Often the main connection dies with this message:

Disconnecting: Received open failure for non-opening channel 3.

This is not deterministic, so I cannot provide instructions to reproduce
this. It /may/ be triggered by sustained traffic in the tunneled
connection at the beginning of the session.

I use "ControlMaster yes" in ~/.ssh/config and key authentication.

The jumphost runs Ubuntu's 1:5.3p1-3ubuntu6.

-- System Information:
Debian Release: wheezy/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: i386 (x86_64)

Kernel: Linux 3.0.0-2-amd64 (SMP w/2 CPU cores)
Locale: LANG=it_IT.utf8, LC_CTYPE=it_IT.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages openssh-client depends on:
ii  adduser                3.113
ii  debconf [debconf-2.0]  1.5.41
ii  dpkg         
ii  libc6                  2.13-21
ii  libedit2               2.11-20080614-3
ii  libgssapi-krb5-2       1.10+dfsg~alpha1-6
ii  libselinux1            2.1.0-4
ii  libssl1.0.0            1.0.0e-3
ii  passwd                 1:
ii  zlib1g                 1:

Versions of packages openssh-client recommends:
ii  openssh-blacklist        <none>
ii  openssh-blacklist-extra  <none>
ii  xauth                    1:1.0.6-1

Versions of packages openssh-client suggests:
pn  keychain      <none>
pn  libpam-ssh    <none>
pn  monkeysphere  <none>
pn  ssh-askpass   <none>

-- Configuration Files:
/etc/ssh/ssh_config changed [not included]

-- no debconf information


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