Don't know AIX. But this same error happened to me several times.
It commonly happened when you login with one name, and then become another
user, and try to open X to your machine.
Hope this help.
On Wed, 16 Jun 1999, Oliver Ehrmann wrote:
> Date: Wed, 16 Jun 1999 11:51:01 +0200
> From: Oliver Ehrmann <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
> Subject: ssh2 on AIX and X11
>
> Hi,
>
> i am trying to launch an X11 program on my AIX machine. I just get an error "Cannot
>open display". Does anybody know why ssh don't sets the right Display variable?
> I am running AIX 4.2.1 and ssh 2.0.13.
>
> O. Ehrmann
> E-Mail: [EMAIL PROTECTED]
>