ERROR: Cannot open X display
Larry Hall (Cygwin X)
Thu Nov 2 16:05:00 GMT 2006
Luis G. Rivera wrote:
> ---- Original message ----
>> Date: Tue, 31 Oct 2006 15:02:18 -0600
>> From: RenÃ© Berber <r.berber <AT> computer <DOT> org>
>> Subject: Re: ERROR: Cannot open X display
>> To: cygwin-xfree <AT> cygwin <DOT> com
>> 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.
>>> 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
>>> 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.
> Thank you for your response. Now, the question is what are the exact
> steps (if there are any) to actually get this to work?
Try skipping the "setenv DISPLAY myipaddress:0.0" step.
Larry Hall http://www.rfk.com
RFK Partners, Inc. (508) 893-9779 - RFK Office
216 Dalton Rd. (508) 893-9889 - FAX
Holliston, MA 01746
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