"Cannot open display" or XDMCP problem ?

[Robert, Francois]

Hi again

Thanks for all your suggestions, all of which I tried : 

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export OS=""
export DISPLAY=<my ip>
Fails in the same way as before

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export OS=" "
export DISPLAY=<my ip>
Fails in the same way as before

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command line changed to XWin95 .... -from <my ip> && xhost +
Fails immediately with the following message :

$ winCreateB... () - Adjusted width: 1018 height: 715
winCreateB... () - width: 1018 height: -715
winCreateB... () - dibsection width: 1018 height: -715
error opening security policy file /usr/X11R6/lib/X11/xserver/SecurityPolicy
Fatal server error:
XDMCP fatal error: Session declined No valid address
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command line changed to XWin95 .... -ac
(to disable access control), removed invocation of xhost +
Fails like before :
_XSERVTransmkdir: Owner of /tmp/.X11-unix should be set to root
winCreateB... () - Adjusted width: 1018 height: 715
winCreateB... () - width: 1018 height: -715
winCreateB... () - dibsection width: 1018 height: -715
error opening security policy file /usr/X11R6/lib/X11/xserver/SecurityPolicy
Fatal server error:
XDMCP fatal error: Session failed Session 151 failed for display
 0.0.0.0:0: Cannot open display

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I don't know what to try next. I am under the impression that the problem is
deeper than expected. By the way, I am NOT using startxwin.bat in a DOS box.
I have made a small bash script instead. Can this be a problem (don't see
why though...) ?

Regards
François