xhost error msg

[Manos Papantoniou <manos@the-heaven.demon.co.uk>]

Hi all, 

when trying to run the xhost command from a tcsh I get the following 
error msg:

ptolemy@eenpc65 28% xhost +
Xlib: connection to "eenpc65:0.0" refused by server
Xlib: Client is not authorized to connect to Server
xhost:  unable to open display "eenpc65:0.0"

as you can see I am running a tcsh with the username ptolemy and
hostname eenpc65

any idea what might be causing that and what can I do to correct it?

thanks in advance

Manos


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