How to start a new Xsession for SSH forwarding?

Question

I want to forward an Xsession over ssh to another system, but I get this error:

Fatal server error:
Server is already active for display 0
    If this server is no longer running, remove /tmp/.X0-lock
    and start again.

I don't want to kill the currently running Xsession. How can I start a new Xsession for ssh forwarding?

Running Ubuntu 12.04 on both client and server.

Solution

As an alternative solution to your problem, you can reuse the existing display :0 for running applications.

DISPLAY=:0 ssh -X [email protected]

Source:
http://www.raspberrypi.org/phpBB3/viewtopic.php?t=8455

Comments

[Dan6073]

You used to be able to drop to a command line and run startx :1 to start a second session.

[Rucent88]

@Mordoc, I found I can start a new xsession over ssh using startx -- :1, though I still couldn't figure out how to forward GUI applications.