>> There is a machine behind a firewall, this user has asked me to connect
> to this machine however its stuck behind a firewall. This user can
> however ssh out to a machine i use on the internet. Is it possible to
> setup that he ssh at myhost and from that i can somehow tunnel back to his
> machine thats behind the firewall through the ssh session that he has
SSH can connect to an external machine, and providing it's a valid user
there, can open a port on the external machine which will tunnel back
down the connect and onto a port on his machine behind the firewall.
SSH manpage has the details iirc.
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