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From: Oleksandr Gavenko <gavenko AT bifit DOT com DOT ua>
Subject: Can not make port forwarding from Cygwin when ControlMaster/ControlPath used.
Date: Mon, 13 Feb 2012 11:18:07 +0200
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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

-- 
Best regards!


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