X/ssh by port forwarding?

From: Kevin Yeung (kevincpyeung1974-usenet_at_yahoo.com.sg)
Date: 04/21/04 

Date: 21 Apr 2004 00:25:50 -0700

Hi all

I understand how the -X flag of ssh allows built-in X tunnelling.
However, for that to happen, the X client machine must be ssh-able.

That means if I want to use my work machine at home, I must be able to
start ssh at home to the work machine. And this is exactly my problem.
My work machine is behind a firewall. I can do the reverse very
nicely, though - i.e., ssh from work to home and start xterm, which is
displayed on the work screen.

So, what I'm thinking is ssh port forwarding using the -L flag. I know
that X listens to port 6000 for :0, 6001 for :1, and so on. But the
following won't work:

home> xhost +work
work> ssh -L 6001:127.0.0.1:6001 home
work> xterm -display :1
xterm Xt error: Can't open display: :1

I checked using netstat to make sure that my work machine is listening
to port 6001. Doing "telnet work 6001" also establishes a valid
connection that gets tunnelled to home:6001.

Could someone tell me what I've done wrong or how I can access my work
machine with X/ssh please?

Thanks in advance.

Regards
Kevin

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