multiple X11 forwards over ssh?

Question

I have two servers (lets say A and B). In order to ssh into A, I need to ssh into B first, and then into A. I want to run some GUI applications on A, so I am looking to forward X11 twice over ssh.

However when I run an application from A I get:

Error: no display specified

Answer 1

Make sure that you're adding the -Y flag, and that X11 forwarding is enabled in both servers' ssh config files in /etc/ssh/sshd_config.

Answer 2

would the following work for you?

export DISPLAY=serverB:0