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Date: Wed, 25 Jun 2008 19:30:44 -0500 (CDT)
From: samk@twinix.com
To: users@tomcat.apache.org
Message-ID: <18440271.111214440244655.JavaMail.SYSTEM@larkin>
Subject: Re: Blocking Proxy Access
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See Thread at: http://www.techienuggets.com/Detail?tx=41765 Posted on behalf of a User

It's to keep undesirables, who have been banned, off from a social networking site.

In Response To: 

> From: noway@spam.com [mailto:noway@spam.com]
> Is there anyway to detect that a web user is trying to access
> my site via an open/anonymous proxy? Other than building a
> list of open proxy IP addresses and checking against it? This
> list would be huge and ever changing. There must be an easier
> way. Sorry if this post is slightly OT.

Open/anonymous proxies deliberately have signatures that are almost identical to any other proxy, so there's no reliable way of knowing based on features of the request.  You need that list.  Unless someone else maintains it (and you trust them to correctly classify proxies), you'll have to build it yourself.  If someone else maintains it, you may be able to use it.

What on earth is the use case, if you don't mind me asking?

                - Peter

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