Using a local proxy with putty fails immediately

From	pk <pk@pk.invalid>
Newsgroups	comp.security.ssh
Subject	Using a local proxy with putty fails immediately
Date	2012-01-26 12:45 +0100
Organization	Aioe.org NNTP Server
Message-ID	<jfrecn$tbc$1@speranza.aioe.org> (permalink)

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As the subject says: I'm trying to use putty to replicate a connection that
I originally used under Linux and that used the ProxyCommand directive.
Following all the docs I could find, I'm doing:

in the main window: user@internalpc, port 22, protocol SSH

in the proxy config panel: local proxy, and local proxy command is

plink.exe -i privatekey.ppk user@externalpc -nc %host:%port


This is running under Windows 7. However, when I try to connect, I
immediately get an error "server unexpectedly closed network connection".
It looks putty isn't even trying to do anything.

What I've tried:

- using actual host and port values in place of %host and %port in the
  local proxy command: same thing
- running the local proxy command on the command line: works fine, that is,
  I see internalpc's SSH banner.

I'm not sure how to debug this. Any help appreciated.

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Using a local proxy with putty fails immediately pk <pk@pk.invalid> - 2012-01-26 12:45 +0100
  Re: Using a local proxy with putty fails immediately Jacob Nevins <jacobn@chiark.greenend.org.uk> - 2012-01-27 11:55 +0000
    Re: Using a local proxy with putty fails immediately pk <pk@pk.invalid> - 2012-01-27 13:28 +0100
      Re: Using a local proxy with putty fails immediately Jacob Nevins <jacobn@chiark.greenend.org.uk> - 2012-01-27 13:43 +0000
        Re: Using a local proxy with putty fails immediately pk <pk@pk.invalid> - 2012-01-27 16:18 +0100
          Re: Using a local proxy with putty fails immediately Jacob Nevins <jacobn@chiark.greenend.org.uk> - 2012-01-30 11:51 +0000
            Re: Using a local proxy with putty fails immediately pk <pk@pk.invalid> - 2012-01-30 13:13 +0100
        Re: Using a local proxy with putty fails immediately Owen Dunn <owend@chiark.greenend.org.uk> - 2012-01-28 11:00 +0000

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