On Wed, 2010-03-31 at 12:23 +0200, Niki Kovacs wrote: 
Hi,

I'm currently configuring Squid and Squidguard for filtering web access 
in a public computer room. So far, everything works fine.

I know how to configure Firefox to use a proxy, but there's no way to 
protect that configuration, e. g. a more knowledgeable user might 
circumvent this configuration. Is there some way to configure an HTTP 
proxy system-wide?

Cheers from the sunny South of France,

Niki
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On the router level, you could block all the traffic and allow only the threads initiated by proxy. Thus you make sure that no 'clever' user can generate outbound traffic.


HTH


Calin

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