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Is there any fool-proof way of preventing users from accessing public proxy / free proxy websites (like proxify) from accessing them so that such users can not bypass Winroute?

I've tried enumerating as many proxy servers / websites in a URL filter, even used keywords...and still users would be able to find a new proxy server website to access to bypass Winroute.

This is becoming such a pain!

Comments / Help, guys........

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Keep adding to the URL filter? I had hundreds of sites filtered in mine. Rolling Eyes

What kind of users do you have, and what sites are you filtering?

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Use the iss filter.

Under the url rules tab, under http policy:
create a new rule that matches the criteria 'rated by the ISS orange web filter system' click select rating and you will find anonymous proxys under IT > Anonymous proxys. This will analyse the pages as they load to determine if they are a proxy. This will add to your list and will help filter out even more proxy sites. I find it is pretty effective

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ISS is not cheap if you have many users, but does the job well. Another alternative solution is to use an open DNS ( there you can modify your configuration settings direct on their DNS.
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