This is fixed in git (adding a new mosh option, --bind-server=ANY) and
will be in the next release.

On Fri, Sep 7, 2012 at 12:12 PM, chrysn <chr...@fsfe.org> wrote:
> Package: mosh, sslh
> Severity: minor
>
> mosh can't be used on hosts that hide their ssh services behind sslh.
>
> when connecting to such a host, mosh displays
>
>> mosh: Nothing received from server on UDP port 60001.
>
> then:
>
>> mosh: Nothing received from server on UDP port 60001. (... s without
>> contact)
>
> the problem seems to be caused by the way the ssh connection is
> established in sslh: sslh forwards the connection by creating another
> tcp stream from itself to the ssh server, causing SSH_CONNECTION have
> "127.0.0.1" in both source and destination ip fields -- and mosh, when
> started with -s, binds to the address it finds in SSH_CONNECTION.
>
> the mosh server seems to get started with -s automatically (even though
> the client seems to just call "mosh-server", it shows up in the process
> list as `mosh-server new -s ...`).
>
>
> several solutions seem feasible, in increasing order of my preference:
>
> * provide a way for the client to specify he doesn't want to use the
>   `-s` option server-side (fix on mosh side)
> * have a server-side configuration option to turn off the `-s` flag for
>   the host (better, as it has to be done only once per host) (fix on
>   mosh side)
> * provide a way to find out the real address (fix on ssh side)
>
>
> as a workaround, i have provided a way around sslh for clients to
> connect directly, but that's not usually what an sslh user wants to do.
>
> -- System Information:
> Debian Release: wheezy/sid
>   APT prefers unstable
>   APT policy: (500, 'unstable'), (1, 'experimental')
> Architecture: amd64 (x86_64)
> Foreign Architectures: i386
>
> Kernel: Linux 3.4-trunk-amd64 (SMP w/2 CPU cores)
> Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
> Shell: /bin/sh linked to /bin/dash
>
> Versions of packages mosh depends on:
> ii  libc6           2.13-35
> ii  libgcc1         1:4.7.1-7
> ii  libio-pty-perl  1:1.08-1+b2
> ii  libprotobuf7    2.4.1-3
> ii  libstdc++6      4.7.1-7
> ii  libtinfo5       5.9-10
> ii  libutempter0    1.1.5-4
> ii  openssh-client  1:6.0p1-3
> ii  zlib1g          1:1.2.7.dfsg-13
>
> mosh recommends no packages.
>
> mosh suggests no packages.
>
> -- no debconf information


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