viuwier escribió: > which would check for a "proxy signature"
"proxy signature" smells terrible bad (aka. insecure) You are trying to solve the problem the wrong way IMHO. Last time I checked this kind of tools ( a year ago or so), they were all using highly sophisticated techniques to bypass your firewall, Im sorry to tell you are propably in a no-win situation, You will be unable to stop these tools unless you mutilate your network functionality in really bad way. I suggest you to fix this problem with LART :) human beings are the most vulnerable element in security.
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