[arch-general] Port 80 is shown open in port scan without any web server running

[Jan de Groot]

On Wed, 2011-03-30 at 15:45 +0530, Partha Chowdhury wrote:
> So it seems my ISP is running squid version 3.2.0.4-20110203 in 
> transparent mode , just like you said.
> 
> Interestingly when connecting to random ip addresses on port 80, the 
> error page returned is quite different from normal ones.
> 
> http://www.freeimagehosting.net/image.php?280f0ef980.png
> 
>   Does this transparent proxy pose any threat and what can I do to
> stop 
> that ?

The threat here is that your ISP will log every page visit you do and
also has the ability to block certain websites.

The only thing you can do is setting up a tunnel or using a different
proxyserver that you trust.