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 *nix systems.
netcat
There is one post tagged netcat.
There is one post tagged netcat.
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 *nix systems.