ERROR: Cannot open X display
René Berber
r.berber@computer.org
Tue Oct 31 21:03:00 GMT 2006
Luis G. Rivera wrote:
> I have used Cygwin/X on two computer in my office and it works
> with no problems. There are several users who cannot use the
> softwared. One in particular gets the following error messages:
>
> ERROR: Cannot open X display. Check display name/server
> access authorization.
[snip]
>
> This is the steps that I use in my office to run Cygwin/X:
>
> 1. Execute “startxwin.bat”.
> 2. On the window that opens I type: xhost +
> hostname.temple.edu. Then I type: ssh –X
> userid@hostname.temple.edu.
> 3. I type my password and get in with no problem. Then I
> type: setenv DISPLAY myipaddress:0.0.
This is wrong, if you used "ssh -X" then DISPLAY is already set (by ssh) and it
has a different value, usually localhost:10.0 for the first connection.
The idea is that ssh will tunnel the X connection through itself (thus
localhost) and it uses a configurable display number (the 10.0).
The reason it works from some computers and not from others is that even if the
X server exists at myipaddress:0.0 it could be blocked by any firewall between
computers; the ssh tunnel is the way to avoid being blocked.
[snip]
--
René Berber
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