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Re: Octave & PLplot

From: Przemek Klosowski
Subject: Re: Octave & PLplot
Date: Mon, 19 Nov 2001 12:29:26 -0500

   I now have octave_plpot basically working.

   However, I have (at least) one problem:
   When the Tcl/Tk window device is requested,
   I get the message:
   X server insecure (must use xauth-style authorization);

This is related to Tcl/Tk's model for interprocess communication,
using the 'send' mechanism. It allows separate Tk processes to send
any Tcl commands for execution in each other's context. Because of
the security implications, Tk rejects simplified X security mechanisms
such as xhost (which is what I'd guess that you use). Any other 
default Tk behavior would be a glaring security hole. 

You can actually change this policy by recompiling Tk with this check
turned off---but I'd recommend that you figure out how to use
xauth. On a single machine, xauth will probably be turned on
by default, and maybe all you need is just typing 'xhost -';
if you display between separate machines, consider using ssh
with X protocol tunneling ('ssh -X machineB').

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