How to connect to server on strange port, or when you're behind a firewall

Situation

cpuxxxx -> FW -> intermediateserver -> targetserver

22......-> 22 -> 22.................-> portnumber_on_targetserver

Connect

On cpuxxxx:

ssh -L portnumber_on_targetserver:targetserver:portnumber_on_targetserver username_on_intermediateserver@intermediateserver

Leave terminal open!

Then on cpuxxxx again:

ssh -YC username_on_targetserver@localhost -p portnumber_on_targetserver

That's it!!

Copy files

from here tot server:

scp -P portnumber_on_targetserver file user@localhost:/path/were/to/put/it/

from server to local:

scp -P portnumber_on_targetserver user@localhost:/path/were/to/get/it/from/ .

Start Konversation from behind a firewall

ssh -L 6667:irc.freenode.org:6667 user@xs3.xs4all.nl
konversation --server localhost

Start Pidgin from home to wzs

• in a terminal typ:

ssh -L 8300:gwmsg.wonen.amsterdam.nl:8300 root@wzs

• leave terminal open
• start pidgin and fill in:

server: localhost

port: 8300