[CentOS] How to export X displays

Akemi Yagi amyagi at gmail.com
Wed Oct 10 02:46:23 UTC 2007

On 10/9/07, techlists at comcast.net <techlists at comcast.net> wrote:
> I have a CentOS server at home and want to view the X display on a laptop running Ubuntu, and not having much success.
> Here's what's been tried so far:
> I ran this command on the CentOS server:
> export DISPLAY=
> And ran this command on the Ubuntu laptop:
> xauth +
> When I try to run, say, xclock on the Ubuntu laptop, this is the error message I'm getting:
> [root at centos-ws ~]# xclock
> Error: Can't open display:
> I'm assuming there's an important little detail I'm missing somewhere, but don't know what.
> Any suggestions?
> Paul

On the CentOS box, edit /etc/ssh/sshd_config to add the line:

X11Forwarding yes

Restart sshd by service sshd restart

>From the Ubuntu box, connect to CentOS by:

ssh -Y centosbox

(use -Y instead of -X, see man ssh for the reason)

There is no need to set  DISPLAY as pointed out earlier.


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