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Can not make port forwarding from Cygwin when ControlMaster/ControlPath used.
- From: Oleksandr Gavenko <gavenko at bifit dot com dot ua>
- To: cygwin at cygwin dot com
- Date: Mon, 13 Feb 2012 11:18:07 +0200
- Subject: Can not make port forwarding from Cygwin when ControlMaster/ControlPath used.
I can forward port from Cygwin to Debian:
cygwin# nc -l -p 6000
debian1# ssh -L 7000:cygwin.host:6000 user@cygwin.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@debian.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
--
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