ssh to “beyond the corporate firewall” through a SOCKS proxy

• https://en.wikibooks.org/wiki/OpenSSH/Cookbook/Proxies_and_Jump_Hosts#Tunneling_SSH_Over_Tor_with_Netcat – this is THE ARTICLE — replace “Tor” in the example with your corporate SOCKS proxy
• http://superuser.com/questions/454210/how-can-i-use-ssh-with-a-socks-5-proxy
• http://linux.die.net/man/1/nc — a netcat manual page

My $HOME/.ssh/config looks like this:

# making use of "netcat" AKA "nc" -- http://linux.die.net/man/1/nc
#
Host SOME_HOST_OUT_THERE
  User REMOTE_USER
  ProxyCommand /usr/bin/nc -X 5 -x SOCKS_PROXY_HOST:SOCKS_PROXY_PORT %h %p

“As always” I connect to SOME_HOST_OUT_THERE like this:

$ ssh REMOTE_USER@SOME_HOST_OUT_THERE
# respectively
$ ssh SOME_HOST_OUT_THERE

You can also “rsync over ssh” under these conditions – works like a charm.

And: This also works in a Cygwin environment.

PuTTY can use a SOCKS proxy just as well for connecting to a target “out there”:

• https://en.wikipedia.org/wiki/PuTTY
• http://the.earth.li/~sgtatham/putty/0.66/htmldoc/Chapter4.html#config-proxy
• http://tartarus.org/~simon/putty-snapshots/htmldoc/Chapter4.html#config-proxy