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Old 12-18-2006, 05:03 PM   #1
andreag
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Registered: Jan 2006
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Reverse SSH tunnel active only from localhost


hi.
I'm finding a little difficult to set up a remote tunnel.
the situation is this: I am running a webserver but my ISP uses NAT and I can't connect to it when I'm not at home.
since I have another working linux box with public static IP I figured a reverse tunnel on port 80 would solve all my troubles.
the situation looks like this:

MYWEBSERVER<-->ISP[NAT]<--WWW-->MYLINUXBOX

so I googled a little and found this way to set up a tunnel (the ssh command was run from the MYWEBSERVER shell, hence the 'localhost'):

ssh -nNT -R 80:localhost:80 root@MYLINUXBOX

seems all fine (no error messages) but when I type MYLINUXBOX's address into the web browser all I get is a 'connection refused' message.
BUT (and here is the big mystery) if I open an ssh shell on MYLINUXBOX and type 'lynx localhost' , I can see MYWEBSERVER's website!
btw, before anybody asks, iptables is not installed.

what could be the problem?
 
Old 12-18-2006, 05:22 PM   #2
raskin
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Registered: Sep 2005
Location: Russia
Distribution: NixOS (http://nixos.org)
Posts: 1,893

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man ssh

Carefully.

Especially -g - allow connections from everywhere.
 
Old 12-19-2006, 02:05 AM   #3
asgozzi
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Registered: Mar 2006
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hey thanks for the immediate answer.
btw I also had to add to 'sshd_config' the 'GatewayPorts yes' option.
now works flawlessly!
 
  


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