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Old 08-05-2010, 02:41 PM   #19
BloodFetish
First Line Centre
 
Join Date: Aug 2009
Location: Coquitlam, BC
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I don't know much about TOR networks, but have spent some time thinking about blocking unproductive websites (facebook, myspace, etc) and therefore internet proxies as well. Same conclusion as others have stated - you can perhaps make it difficult and/or increase your time administrating your solution, but nothing is absolute.

I don't know much about TOR, though. Is the bandwidth used by TOR (and similar) mostly on port 443? If so, could you build a list of allowable https websites (like online banking) and then deny everything else on port 443? You would have to provide some way for end users to request https sites to be included on your allowable list...
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