Re: ERROR: Cannot open X display

[Renà Berber <r dot berber at computer dot org>]

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 âstartxwin.batâ.
> 2.	On the window that opens I type: xhost +
> hostname.temple.edu.  Then I type: ssh âX
> 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]
-- 
Renà Berber


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