How to enable SSH X11 forwarding through additional server?

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There are several ways to do this, the one I prefer is to forward the ssh port:

First, connect to machine B and forward [localPort] to C:22 through B

A$ ssh -L [localPort]:C:22 B

Next, connect to C from A through this newly-created tunnel using [localPort], forwarding X11

A$ ssh -X -p [localPort] localhost

Now we can run X11 programs on C and have them display on A

C$ xclock

[localPort] can be any port that you are not already listening to on A, I often use 2222 for simplicity.

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