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Date:	Mon, 13 Feb 2012 14:53:13 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Can not make port forwarding from Cygwin when ControlMaster/ControlPath used.
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On Feb 13 11:18, Oleksandr Gavenko wrote:
> 
> I can forward port from Cygwin to Debian:
> 
>   cygwin# nc -l -p 6000
> 
>   debian1# ssh -L 7000:cygwin.host:6000 user AT cygwin DOT host
> 
>   debian2# telnet localhost 7000
> 
> But if do same in inverse direction I got:
> 
>   debian# nc -l -p 6000
> 
>   cygwin1# ssh -L 8000:debian.host:6000 user AT debian DOT host
> 
>   bind: Address already in use
>   channel_setup_fwd_listener: cannot listen to port: 8000
>   Could not request local forwarding.
> 
> I don't understand what this mean...
> 
> netstat under Cygwin is Windows utility:
> 
>   debian# netstat -l -n | grep 6000
>   tcp        0      0 0.0.0.0:6000            0.0.0.0:*               LISTEN
> 
>   cygwin2#  netstat -n -a -n
> 
>   TCP    127.0.0.1:8000         0.0.0.0:0              LISTENING       2308
>   [ssh.exe]
> 
> Note that ssh.exe is not "ssh -L" but that I run to connect to debian.host for
> "nc -l -p 6000".
> 
> To resolve issue I comment this line in ~/.ssh/config:
> 
>   # ControlPath ~/.ssh/sock_%r@%h_%p
>   # ControlMaster auto

Works for me with or without these lines.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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