SSH via HTTP proxy
If you happen to be stuck behind a corporate firewall with only HTTP proxies for external access, you might still be able to SSH out through them using the built-in nc on OSX.
First, hope that the proxies haven't disabled the CONNECT method, then simply add a section to your .ssh/config like this:
Host foobar.example.com ProxyCommand nc -X connect -x proxyhost:proxyport %h %p ServerAliveInterval 10
This will tunnel the connection through the HTTP proxy to the remote server.
The ServerAliveInterval setting is required as most proxies will drop the connection after a period of inactivity.
To avoid issues with trying to connect to the host when not behind the corporate firewall, replace the above with a fake entry for the proxy method like this:
Host foobar-proxy.example.com HostName foobar.example.com ProxyCommand nc -X connect -x proxyhost:proxyport %h %p ServerAliveInterval 10
# ssh foobar-proxy.example.com
when inside the firewall, and
# ssh foobar.example.com
Simple, no external software required.
Cristina said ...
<comment date="2013-01-21T22:47:17Z" name="Cristina"> As a Rogue Tech Support Agent, I've been telling my detecjed Pre users to try a lanyard. The iPhone lacks a proper lanyard hole for this purpose, shame on them. </comment>