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 From:  Rolf Kutz <kutz at netcologne dot de>
 To:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] Mystical open port 80...can't block
 Date:  Wed, 23 May 2007 15:20:22 +0200
* Quoting Hart, Benjamin (bhart at unifiedbrands dot net):

> I ran nmap from a machine here at work yesterday and noticed that I
> still had pptp enabled and the port was open..also notice that port 80
> was open as well but not accepting connections.  Last night I created a
> rule explicitly blocking port 80 and disabled the pptp setup.  However
> today I just did another nmap scan and found that those two ports are
> still open...what gives?

It might be a transparent proxy somewhere on the
way. You can check that with tcptraceroute and
different target ports.

regards, Rolf