Using SSH over a Proxy

Written by BinnyVA on April 9, 2007 – 1:42 am -

Back in the days when I was working in a web development company, I had to ssh into some sites for setting up crons, importing database dumps etc. But there was a problem – my system was behind a proxy. And SSH did not have an option to connect through a proxy.

To use ssh over a proxy connection, you need a software called Cocrkscrew. Download the source and compile/install it.

Installation

wget http://www.agroman.net/corkscrew/corkscrew-2.0.tar.gz
tar -xzf corkscrew-2.0.tar.gz
cd corkscrew-2.0
./configure
make
su
[Enter Password]
make install

Configuration

Open the file ~/.ssh/config

Add this line..

ProxyCommand /usr/local/bin/corkscrew <proxy_server_ip> <proxy_server_port> %h %p

Example…

ProxyCommand /usr/local/bin/corkscrew 192.168.1.15 80 %h %p

Here 192.168.1.15 is the proxy server and 80 is the port.

After this is done, just connect to the remote server using ssh.

ssh google.com

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Posted in Networking, Tools | 10 Comments »

10 Comments to “Using SSH over a Proxy”

rohitj’s Blog » SSH over Proxy says:

January 7, 2008 at 9:11 am

[...] was a post on LinDesk about how to use SSH over proxy. Thats surely a big issue for people living in developing country. They have to work behind proxy. [...]
Clemens says:

September 3, 2008 at 12:35 pm

Thank you, works perfect.

Note: If the proxy requires authentication, you have to create a file with the content
:

Make this file readable only by yourself by
chmod a-r
chmod u+r

and then alter the line in ~/.ssh/config to
ProxyCommand /usr/local/bin/corkscrew 192.168.1.15 80 %h %p

(From the corkscrew man page)
Shailendra says:

September 11, 2008 at 5:24 pm

Great!!!

Worked perfect.
Jeremy says:

November 27, 2008 at 9:54 am

Thanks, worked perfectly!
Thomas says:

March 5, 2009 at 1:02 am

I can’t get it to work. I’m a nub when it comes to using CMD. I can’t get the kode to work. please help me:D
Chris says:

May 19, 2009 at 7:57 pm

Can you say… awesome!
Josu says:

August 3, 2009 at 10:52 pm

Hello, thanks for this article.

But I have problems connecting to diferent port:

$ ssh -p 8080 myserver
Proxy could not open connnection to 85.50.69.178: Forbidden
ssh_exchange_identification: Connection closed by remote host

I have a proxy and a firewall. I configured my server SSh service on 8080.

If I write on a firefox “myserver” i have:

SSH-2.0-OpenSSH_5.1p1 Debian-5

Thanks for all.
ron says:

October 18, 2009 at 12:41 am

when it comes to using CMD.

Your need an ssh client for windows first.
Johnno says:

April 8, 2010 at 5:21 pm

Putty does this natively now and is available on most platforms.

If proxies are tighter and block you from pushing ssh over a http(s) port then you can use proxytunnel and apache mod_proxy to encrypt your ssh inside https. Course you then have https->ssh->tunnel so have twice the encryption which is ait of a overhead but worth it for the ability to really tunnel ssh over any webproxy:

http://www.saulchristie.com/how-to/bypass-firewalls
hata says:

June 2, 2010 at 12:47 pm

i had install corkscrew on solaris 10, but
when i try to connect to other server.

message like this.

# /usr/local/bin/corkscrew 192.168.100.101 800 202.134.134.205 22
Proxy could not open connnection to 202.134.134.205: Forbidden

any help, please….

Lindesk