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Can not make port forwarding from Cygwin when ControlMaster/ControlPath used.

On  Mon, 13 Feb 2012 11:18:07 +0200,  Oleksandr Gavenko <...@bifit.com.ua

I can forward port from Cygwin to Debian:

  cygwin# nc -l -p 6000

  debian1# ssh -L 7000:cygwin.host:6000 use...@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 use...@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

-- 

Best regards!

--

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	On Mon, 13 Feb 2012 14:53:13 +0100, Corinna Vinschen <...@cygwin.com 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 -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple


	On Mon, 13 Feb 2012 15:00:27 +0100, Corinna Vinschen <...@cygwin.com Btw., connection sharing doesn't work on Cygwin. For this to work we need descriptor passing over AF_LOCAL sockets, which isn't implemented in Cygwin. Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Project Co-Leader cygwin AT cygwin DOT com Red Hat -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple


	On Mon, 13 Feb 2012 18:34:19 +0200, Oleksandr Gavenko <...@bifit.com.ua OK, thanks for explanation. As possible solution: * comment above lines * pass "-S none" to ssh Note that ssh create files ~/.ssh/sock_%r@%h_%p so code partially work. -- Best regards! -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple


	On Mon, 13 Feb 2012 19:50:32 -0500, Charles Wilson <...@cwilson.fastmail.fm Yes, please! (I know, I know, SHTDI). http://cygwin.com/ml/cygwin/2009-10/msg00397.html See Corinna's and cgf's comments downthread. -- Chuck -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple


	On Tue, 14 Feb 2012 09:53:18 +0100, Corinna Vinschen <...@cygwin.com ...and in contrast to what Dave replied even the DuplicateHandle part is not trivial. It requires one of the processes to have PROCESS_DUP_HANDLE rights for the other process. But since you're connected over a socket, you don't know the process ID of your peer(). And then, either one of the processes is an admin process, or both processes belong to the same user account, or one of the processes must know the SID of the peer process and open up its process for PROCESS_DUP_HANDLE access to that user account. Corinna () getpeereid only works for the listening/connecting processes, not for forked child processes thereof. -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Project Co-Leader cygwin AT cygwin DOT com Red Hat -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple

Discussion Title: Can not make port forwarding from Cygwin when ControlMaster/ControlPath used.
Title Keywords: make port forwarding from Cygwin when ControlMaster/ControlPath used.

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