Hello,

> Changed & tried, but I have the same error.

well, this was only some additional remarks. Perhaps you can use
strace to find out why ConTeXt can't write mpgraph.mp?

What does your cont-sys.tex look like? Do you have write18 enabled
(disable it on the public webserver, of course!).



>> You should be extremly careful when interfacing TeX to the public.

with that I mean

* use setrlimt
* disable write18
* use openout=p, openin=p
* hide other user's ConTeXt run by using sessions
* use some kind of jail if possible
* do some checking on user's input

Unless you want to share your webserver with other people ;-)

Patrick
-- 
ConTeXt wiki and more: http://contextgarden.net
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